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123-409: A rainbow flag is a multicolored flag consisting of the colors of the rainbow . The designs differ, but many of the colors are based on the seven spectral colors of the visible light spectrum . In the 18th century, American Revolutionary War writer Thomas Paine proposed that a rainbow flag be used as a maritime flag to signify neutral ships in time of war. Contemporary international uses of
246-625: A heraldic device in battle, allowing easier identification of a knight over only the heraldic icon painted on the shield. Already during the high medieval period, and increasingly during the Late Middle Ages , city states and communes such as those of the Old Swiss Confederacy also began to use flags as field signs. Regimental flags for individual units became commonplace during the Early Modern period . During
369-513: A misnomer , as their energy comes from the nucleus of the atom, just as it does with fusion weapons. In fission weapons, a mass of fissile material ( enriched uranium or plutonium ) is forced into supercriticality —allowing an exponential growth of nuclear chain reactions —either by shooting one piece of sub-critical material into another (the "gun" method) or by compression of a sub-critical sphere or cylinder of fissile material using chemically fueled explosive lenses . The latter approach,
492-665: A policy of deliberate ambiguity , it does not acknowledge having them. Germany , Italy , Turkey , Belgium , the Netherlands , and Belarus are nuclear weapons sharing states. South Africa is the only country to have independently developed and then renounced and dismantled its nuclear weapons. The Treaty on the Non-Proliferation of Nuclear Weapons aims to reduce the spread of nuclear weapons, but there are different views of its effectiveness. There are two basic types of nuclear weapons: those that derive
615-456: A closed beach (in the UK also other dangers), yellow signifies strong current or difficult swimming conditions, and green represents a beach safe for general swimming. In Ireland, a red and yellow flag indicates that it is safe to swim; a red flag that it is unsafe; and no flag indicates that there are no lifeguards on duty. Blue flags may also be used away from the yellow-red lifesaver area to designate
738-600: A combination of fission and fusion reactions ( thermonuclear bomb ), producing a nuclear explosion . Both bomb types release large quantities of energy from relatively small amounts of matter . The first test of a fission ("atomic") bomb released an amount of energy approximately equal to 20,000 tons of TNT (84 TJ ). The first thermonuclear ("hydrogen") bomb test released energy approximately equal to 10 million tons of TNT (42 PJ). Nuclear bombs have had yields between 10 tons TNT (the W54 ) and 50 megatons for
861-696: A conference—called for in the manifesto—in Pugwash, Nova Scotia , Eaton's birthplace. This conference was to be the first of the Pugwash Conferences on Science and World Affairs , held in July 1957. By the 1960s, steps were taken to limit both the proliferation of nuclear weapons to other countries and the environmental effects of nuclear testing . The Partial Nuclear Test Ban Treaty (1963) restricted all nuclear testing to underground nuclear testing , to prevent contamination from nuclear fallout, whereas
984-458: A faster and less vulnerable attack, the development of long-range intercontinental ballistic missiles (ICBMs) and submarine-launched ballistic missiles (SLBMs) has given some nations the ability to plausibly deliver missiles anywhere on the globe with a high likelihood of success. More advanced systems, such as multiple independently targetable reentry vehicles (MIRVs), can launch multiple warheads at different targets from one missile, reducing
1107-614: A few nations possess such weapons or are suspected of seeking them. The only countries known to have detonated nuclear weapons—and acknowledge possessing them—are (chronologically by date of first test) the United States , the Soviet Union (succeeded as a nuclear power by Russia ), the United Kingdom , France , China , India , Pakistan , and North Korea . Israel is believed to possess nuclear weapons, though, in
1230-555: A fission bomb to initiate them. Such a device might provide a simpler path to thermonuclear weapons than one that required the development of fission weapons first, and pure fusion weapons would create significantly less nuclear fallout than other thermonuclear weapons because they would not disperse fission products. In 1998, the United States Department of Energy divulged that the United States had, "...made
1353-548: A flag harks back to the rainbow as a symbol of biblical promise. According to the Bible, God used the rainbow as a sign to Noah that there would never again be a worldwide flood, also known as the Rainbow covenant . A rainbow flag was proposed for Armenia when it regained independence after World War I. It was designed by Armenian artist Martiros Saryan . It was not adopted as the country instead went with three stripes using
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#17327802625681476-481: A flag with a seven-colour rainbow. The number of colours is meant to symbolize the seven-branched Jewish Menorah . Its colours are slightly different from the basic spectral colours, with gold in place of yellow, vivid blue instead of light blue, and indigo as dark blue. In 2013, the flag was checked according to the Russian gay propaganda law . JAO flag was confirmed as safe because of white background, white borders to
1599-421: A fusion weapon as of January 2016 , though this claim is disputed. Thermonuclear weapons are considered much more difficult to successfully design and execute than primitive fission weapons. Almost all of the nuclear weapons deployed today use the thermonuclear design because it results in an explosion hundreds of times stronger than that of a fission bomb of similar weight. Thermonuclear bombs work by using
1722-783: A general tool for rudimentary signalling and identification, especially in environments where communication is challenging (such as the maritime environment , where semaphore is used). Many flags fall into groups of similar designs called flag families . The study of flags is known as " vexillology " from the Latin vexillum , meaning "flag" or " banner ". National flags are patriotic symbols with widely varied interpretations that often include strong military associations because of their original and ongoing use for that purpose. Flags are also used in messaging , advertising , or for decorative purposes. Some military units are called "flags" after their use of flags. A flag (Arabic: لواء )
1845-564: A horizontal crossbar from which it is hoisted, either by a vertical pole (no. 5a) or a horizontal one (no. 5b). The topmost stripe on the horizontal version of the flag normally faces to the left. Flags can play many different roles in religion. In Buddhism , prayer flags are used, usually in sets of five differently coloured flags. Several flags and banners including the Black Standard are associated with Islam . Many national flags and other flags include religious symbols such as
1968-577: A military fort, base, station or post and at sea at the stern (rear) or main top mast of a warship, a Naval Jack flag and other maritime flags , pennants and emblems are flown at the bow (front). In times of war waving a white flag is a banner of truce, talks/negotiations or surrender. Four distinctive African flags currently in the collection of the National Maritime Museum in Britain were flown in action by Itsekiri ships under
2091-495: A military or naval context began with the rise of nationalism by the end of the 18th century, although some flags date back earlier. The flags of countries such as Austria, Denmark or Turkey have legendary origins while many others, including those of Poland and Switzerland, grew out of the heraldic emblems of the Middle Ages. The 17th century saw the birth of several national flags through revolutionary struggle. One of these
2214-472: A mystery, the oldest flag discovered is made of bronze: a Derafsh or 'flag-like' Shahdad, which was found in Shahdad , Iran, and dates back to c. 2400 BC . It features a seated man and a kneeling woman facing each other, with a star in between. This iconography was found in other Iranian Bronze Age pieces of art. Flags made of cloth were almost certainly the invention of the ancient peoples of
2337-472: A nation's economic electronics-based infrastructure. Because the effect is most effectively produced by high altitude nuclear detonations (by military weapons delivered by air, though ground bursts also produce EMP effects over a localized area), it can produce damage to electronics over a wide, even continental, geographical area. Research has been done into the possibility of pure fusion bombs : nuclear weapons that consist of fusion reactions without requiring
2460-537: A new nuclear strategy, one that is distinct from that which gave relative stability during the Cold War. Since 1996, the United States has had a policy of allowing the targeting of its nuclear weapons at terrorists armed with weapons of mass destruction . Robert Gallucci argues that although traditional deterrence is not an effective approach toward terrorist groups bent on causing a nuclear catastrophe, Gallucci believes that "the United States should instead consider
2583-425: A nuclear war between two nations would result in mutual annihilation. From this point of view, the significance of nuclear weapons is to deter war because any nuclear war would escalate out of mutual distrust and fear, resulting in mutually assured destruction . This threat of national, if not global, destruction has been a strong motivation for anti-nuclear weapons activism. Critics from the peace movement and within
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#17327802625682706-411: A nuclear weapon from another country by threatening nuclear retaliation is known as the strategy of nuclear deterrence . The goal in deterrence is to always maintain a second strike capability (the ability of a country to respond to a nuclear attack with one of its own) and potentially to strive for first strike status (the ability to destroy an enemy's nuclear forces before they could retaliate). During
2829-465: A nuclear weapon is a gravity bomb dropped from aircraft ; this was the method used by the United States against Japan in 1945. This method places few restrictions on the size of the weapon. It does, however, limit attack range, response time to an impending attack, and the number of weapons that a country can field at the same time. With miniaturization, nuclear bombs can be delivered by both strategic bombers and tactical fighter-bombers . This method
2952-409: A nuclear weapon to its target is an important factor affecting both nuclear weapon design and nuclear strategy . The design, development, and maintenance of delivery systems are among the most expensive parts of a nuclear weapons program; they account, for example, for 57% of the financial resources spent by the United States on nuclear weapons projects since 1940. The simplest method for delivering
3075-433: A nuclear weapon with suitable materials (such as cobalt or gold ) creates a weapon known as a salted bomb . This device can produce exceptionally large quantities of long-lived radioactive contamination . It has been conjectured that such a device could serve as a "doomsday weapon" because such a large quantity of radioactivities with half-lives of decades, lifted into the stratosphere where winds would distribute it around
3198-663: A number of non-cooperative groups led to confusion in several countries around the world. This rainbow flag in Italy was first used in a peace march in 1961, inspired by similar multi-coloured flags used in demonstrations against nuclear weapons . It became popular with the Pace da tutti i balconi ("peace from every balcony") campaign in 2002, started as a protest against the impending war in Iraq . The most common variety has seven colours, purple, blue, azure , green, yellow, orange and red, and
3321-421: A policy of expanded deterrence, which focuses not solely on the would-be nuclear terrorists but on those states that may deliberately transfer or inadvertently leak nuclear weapons and materials to them. By threatening retaliation against those states, the United States may be able to deter that which it cannot physically prevent.". Graham Allison makes a similar case, arguing that the key to expanded deterrence
3444-617: A rainbow flag dates to the beginning of the 20th century. The International Co-operative Alliance adopted a rainbow flag in 1925. A similar flag (ca. 1920) is used in Andean indigenism in Peru and Bolivia to represent the legacy of the Inca Empire . Since 1961, the international peace flag , also known as the PACE flag, has been especially popular in Italy and to a lesser extent Europe and
3567-447: A significant portion of their energy from fission reactions used to "trigger" fusion reactions, and fusion reactions can themselves trigger additional fission reactions. Only six countries—the United States , Russia , the United Kingdom , China , France , and India —have conducted thermonuclear weapon tests. Whether India has detonated a "true" multi-staged thermonuclear weapon is controversial. North Korea claims to have tested
3690-550: A substantial investment" in the past to develop pure fusion weapons, but that, "The U.S. does not have and is not developing a pure fusion weapon", and that, "No credible design for a pure fusion weapon resulted from the DOE investment". Nuclear isomers provide a possible pathway to fissionless fusion bombs. These are naturally occurring isotopes ( Hf being a prominent example) which exist in an elevated energy state. Mechanisms to release this energy as bursts of gamma radiation (as in
3813-707: A symbol of native ethnic groups and culture, and is anachronistically associated with the Tawantin Suyu , or Inca territory. Although commonly believed in Peru to be a flag of the Incan Empire , the oldest known rainbow flag dates back only to the 18th century and was used by Túpac Amaru II during his indigenous revolt against the Spanish . María Rostworowski , a Peruvian historian known for her extensive and detailed publications about Peruvian Ancient Cultures and
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3936-480: A zone for surfboarding and other small, non-motorised watercraft. Reasons for closing the beach include: A surf flag exists, divided into four quadrants. The top left and bottom right quadrants are black, and the remaining area is white. Signal flag "India" (a black circle on a yellow square) is frequently used to denote a "blackball" zone where surfboards cannot be used but other water activities are permitted. The United States uses beach warning flags created by
4059-420: Is a thermonuclear weapon that yields a relatively small explosion but a relatively large amount of neutron radiation . Such a weapon could, according to tacticians, be used to cause massive biological casualties while leaving inanimate infrastructure mostly intact and creating minimal fallout. Because high energy neutrons are capable of penetrating dense matter, such as tank armor, neutron warheads were procured in
4182-423: Is a vertical form of the standard flag. The flag's design may remain unchanged (No. 2a) or it may change, e.g. by changing horizontal stripes to vertical ones (no. 2b). If the flag carries an emblem, it may remain centred or may be shifted slightly upwards. The vertical flag for hoisting from a beam (German: Auslegerflagge or Galgenflagge ; no. 3) is additionally attached to a horizontal beam, ensuring that it
4305-456: Is analogous to identifying a criminal by fingerprints. "The goal would be twofold: first, to deter leaders of nuclear states from selling weapons to terrorists by holding them accountable for any use of their weapons; second, to give leaders every incentive to tightly secure their nuclear weapons and materials." According to the Pentagon's June 2019 " Doctrine for Joint Nuclear Operations " of
4428-627: Is checked on the web and issued online, and it is used as a guideline to show that businesses are working on infection prevention measures. During the 2020 coronavirus pandemic in the United Kingdom, the rainbow symbol has been used to signify support and gratitude for the National Health Service (NHS). However, the increasing association of the six-color Pride rainbow flag with the NHS has caused concern among some members of
4551-403: Is coming up with ways of tracing nuclear material to the country that forged the fissile material. "After a nuclear bomb detonates, nuclear forensics cops would collect debris samples and send them to a laboratory for radiological analysis. By identifying unique attributes of the fissile material, including its impurities and contaminants, one could trace the path back to its origin." The process
4674-670: Is copyrighted and fees are paid to Quasar for commercial duplication and sales of his design. The leftist Herri Batasuna party used a rainbow version of the Ikurriña (Basque national flag) from 1978 until it was dissolved in 2001. Another variation of rainbow flag is used by Jewish Autonomous Oblast , situated in the Far Eastern Federal District of Russia, by the Chinese border. Proportions 2:3. Adopted first of October 1996. The Jewish Autonomous Oblast has
4797-412: Is done on both the state flag of Maryland and the flag of Kiribati . The de jure flag of Libya under Muammar Gaddafi , which consisted of a rectangular field of green, was for a long period the only national flag using a single colour and no design or insignia. However, other historical states have also used flags without designs or insignia, such as the short-lived Soviet Republic of Hungary and
4920-471: Is emblazoned in bold with the Italian word PACE , meaning "peace". Common variations include moving the purple stripe down below the azure one, and adding a white stripe on top (the original flag from the 60s had a white stripe on top). This flag has been adopted internationally as a symbol of the peace movement . The Flag of Cusco was introduced in Peru in 1973, and became used as the official emblem of
5043-616: Is equivalent to a brigade in Arab countries. In Spain, a flag (Spanish: bandera ) is a battalion -equivalent in the Spanish Legion . The origin of the flag is unknown and it remains unclear when the first flag was raised. Ships with vexilloids were represented on predynastic Egyptian pottery c. 3500 BC . In antiquity, field signs that can be categorised as vexilloid or "flag-like" were used in warfare, originating in ancient Egypt or Assyria . Examples include
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5166-481: Is for the purpose of achieving different yields for different situations , and in manipulating design elements to attempt to minimize weapon size, radiation hardness or requirements for special materials, especially fissile fuel or tritium. Some nuclear weapons are designed for special purposes; most of these are for non-strategic (decisively war-winning) purposes and are referred to as tactical nuclear weapons . The neutron bomb purportedly conceived by Sam Cohen
5289-409: Is fully displayed even if there is no wind. The vertical flag for hoisting from a horizontal pole (German: Hängeflagge ; no. 4) is hoisted from a horizontal pole, normally attached to a building. The topmost stripe on the horizontal version of the flag faces away from the building. The vertical flag for hoisting from a crossbar or banner (German: Bannerflagge ; no. 5) is firmly attached to
5412-431: Is most commonly flown with the red stripe on top, as the colors appear in a natural rainbow. The colors were determined to symbolize: The color pink stood for sexuality and turquoise stood for art/magic. During the 1980s, a black stripe representing AIDS victims was added to the bottom of a rainbow flag as a seventh color and named the "Victory Over AIDS" flag. In the late 2010s, the 1978 Pride flag by Gilbert Baker
5535-503: Is no evidence that it is feasible beyond the military domain. However, the U.S. Air Force funded studies of the physics of antimatter in the Cold War , and began considering its possible use in weapons, not just as a trigger, but as the explosive itself. A fourth generation nuclear weapon design is related to, and relies upon, the same principle as antimatter-catalyzed nuclear pulse propulsion . Most variation in nuclear weapon design
5658-409: Is not a fusion bomb. In the boosted bomb, the neutrons produced by the fusion reactions serve primarily to increase the efficiency of the fission bomb. There are two types of boosted fission bomb: internally boosted, in which a deuterium-tritium mixture is injected into the bomb core, and externally boosted, in which concentric shells of lithium-deuteride and depleted uranium are layered on the outside of
5781-490: Is not clear that this has ever been implemented, and their plausible use in nuclear weapons is a matter of dispute. The other basic type of nuclear weapon produces a large proportion of its energy in nuclear fusion reactions. Such fusion weapons are generally referred to as thermonuclear weapons or more colloquially as hydrogen bombs (abbreviated as H-bombs ), as they rely on fusion reactions between isotopes of hydrogen ( deuterium and tritium ). All such weapons derive
5904-408: Is not symmetric and should be read in the same direction, regardless of whether the hoist is to the viewer's left or right. These cases can be divided into two types: Common designs on flags include crosses, stripes, and divisions of the surface, or field , into bands or quarters—patterns and principles mainly derived from heraldry . A heraldic coat of arms may also be flown as a banner of arms , as
6027-519: Is often portrayed with a rainbow banner in his hand. The Thomas Müntzer statue in the German town of Stolberg also shows him holding a rainbow banner in his hand. In the German Peasants' War of the 16th century, Müntzer's rainbow banner together with the peasants' boot (" Bundschuh ") was used as the sign of a new era, of hope and of social change . The choice of the rainbow in the form of
6150-454: Is the primary means of nuclear weapons delivery; the majority of U.S. nuclear warheads, for example, are free-fall gravity bombs, namely the B61 , which is being improved upon to this day. Preferable from a strategic point of view is a nuclear weapon mounted on a missile , which can use a ballistic trajectory to deliver the warhead over the horizon. Although even short-range missiles allow for
6273-401: Is used to mark the limits of the bathing area on a beach, usually guarded by surf lifesavers . If the beach is closed, the poles of the flags are crossed. The flags are coloured with a red triangle and a yellow triangle making a rectangular flag, or a red rectangle over a yellow rectangle. On many Australian beaches there is a slight variation with beach condition signalling. A red flag signifies
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#17327802625686396-439: The 5 October 1910 revolution which brought this party to power. Throughout history, monarchs have often had personal flags (including royal standards ), representing the royal person, including in personal union of national monarchies. Flags are often representative of an individual's affinity or allegiance to a country, team or business and can be presented in various ways. A popular trend that has surfaced revolves around
6519-577: The Indian subcontinent or the Zhou dynasty of Ancient China . Chinese flags had iconography such as a red bird, a white tiger, or a blue dragon, and royal flags were to be treated with a level of respect similar to that given to the ruler. Indian flags were often triangular and decorated with attachments such as a yak 's tail and the state umbrella. Silk flags either spread to the Near East from China or it
6642-661: The International Life Saving Federation and endorsed and conditionally approved by the United States Lifesaving Association . Railways use a number of coloured flags. When used as wayside signals they usually use the following meanings (exact meanings are set by the individual railroad company): Nuclear weapon A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions , either fission (fission bomb) or
6765-574: The Sassanid battle standard Derafsh Kaviani , and the standards of the Roman legions such as the eagle of Augustus Caesar 's Xth legion and the dragon standard of the Sarmatians ; the latter was allowed to fly freely in the wind, carried by a horseman, but depictions suggest that it bore more similarity to an elongated dragon kite than to a simple flag. While the origin of the flag remains
6888-695: The Starfish Prime high-altitude nuclear test in 1962, an unexpected effect was produced which is called a nuclear electromagnetic pulse . This is an intense flash of electromagnetic energy produced by a rain of high-energy electrons which in turn are produced by a nuclear bomb's gamma rays. This flash of energy can permanently destroy or disrupt electronic equipment if insufficiently shielded. It has been proposed to use this effect to disable an enemy's military and civilian infrastructure as an adjunct to other nuclear or conventional military operations. By itself it could as well be useful to terrorists for crippling
7011-554: The Tsar Bomba (see TNT equivalent ). A thermonuclear weapon weighing as little as 600 pounds (270 kg) can release energy equal to more than 1.2 megatonnes of TNT (5.0 PJ). A nuclear device no larger than a conventional bomb can devastate an entire city by blast, fire, and radiation . Since they are weapons of mass destruction , the proliferation of nuclear weapons is a focus of international relations policy. Nuclear weapons have been deployed twice in war , both by
7134-676: The Tsar Bomba of the USSR, which released an energy equivalent of over 50 megatons of TNT (210 PJ), was a three-stage weapon. Most thermonuclear weapons are considerably smaller than this, due to practical constraints from missile warhead space and weight requirements. In the early 1950s the Livermore Laboratory in the United States had plans for the testing of two massive bombs, Gnomon and Sundial , 1 gigaton of TNT and 10 gigatons of TNT respectively. Fusion reactions do not create fission products, and thus contribute far less to
7257-568: The cross , the crescent , or a reference to a patron saint. Flags are also adopted by religious groups and flags such as the Jain flag , Nishan Sahib ( Sikhism ), the Saffron flag ( Hindu ) and the Christian flag are used to represent a whole religion. Because of their ease of signalling and identification, flags are often used in sports . Some countries use diplomatic flags, such as
7380-424: The hafnium controversy ) have been proposed as possible triggers for conventional thermonuclear reactions. Antimatter , which consists of particles resembling ordinary matter particles in most of their properties but having opposite electric charge , has been considered as a trigger mechanism for nuclear weapons. A major obstacle is the difficulty of producing antimatter in large enough quantities, and there
7503-614: The head of government or head of state . Despite controls and regulations governing nuclear weapons, there is an inherent danger of "accidents, mistakes, false alarms, blackmail, theft, and sabotage". In the late 1940s, lack of mutual trust prevented the United States and the Soviet Union from making progress on arms control agreements. The Russell–Einstein Manifesto was issued in London on July 9, 1955, by Bertrand Russell in
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#17327802625687626-520: The national flag . Other countries' armed forces (such as those of the United States or Switzerland) use their standard national flag ; in addition, the U.S. has alongside flags and seals designed from long tradition for each of its six uniformed military services/military sub-departments in the Department of Defense and the Department of Homeland Security . The Philippines' armed forces may use their standard national flag , but during times of war
7749-614: The rainbow flag was adopted as a symbol of the LGBT social movements . Its derivatives include the Bisexual pride and Transgender pride flags . Some of these political flags have become national flags, such as the red flag of the Soviet Union and national socialist banners for Nazi Germany . The present Flag of Portugal is based on what had been the political flag of the Portuguese Republican Party previous to
7872-436: The tropopause into the stratosphere , where the calm non-turbulent winds permit the debris to travel great distances from the burst, eventually settling and unpredictably contaminating areas far removed from the target of the explosion. There are other types of nuclear weapons as well. For example, a boosted fission weapon is a fission bomb that increases its explosive yield through a small number of fusion reactions, but it
7995-650: The "Progress Pride" flag by Daniel Quasar incorporated the black and brown stripes of the Philly Pride flag, and colors of the 1999 transgender flag by Monica Helms , as a chevron on the Pride flag symbolizing queer, trans, and people of color. However, unlike the Gilbert Baker flag, transgender flag, and "More Color, More Pride" flag designs which are in the public domain , the Progress Pride flag
8118-537: The "implosion" method, is more sophisticated and more efficient (smaller, less massive, and requiring less of the expensive fissile fuel) than the former. A major challenge in all nuclear weapon designs is to ensure that a significant fraction of the fuel is consumed before the weapon destroys itself. The amount of energy released by fission bombs can range from the equivalent of just under a ton to upwards of 500,000 tons (500 kilotons ) of TNT (4.2 to 2.1 × 10 GJ). All fission reactions generate fission products ,
8241-586: The 1980s (though not deployed in Europe) for use as tactical payloads for US Army artillery shells (200 mm W79 and 155 mm W82 ) and short range missile forces. Soviet authorities announced similar intentions for neutron warhead deployment in Europe; indeed, they claimed to have originally invented the neutron bomb, but their deployment on USSR tactical nuclear forces is unverifiable. A type of nuclear explosive most suitable for use by ground special forces
8364-425: The Cold War, policy and military theorists considered the sorts of policies that might prevent a nuclear attack, and they developed game theory models that could lead to stable deterrence conditions. Different forms of nuclear weapons delivery (see above) allow for different types of nuclear strategies. The goals of any strategy are generally to make it difficult for an enemy to launch a pre-emptive strike against
8487-517: The Inca Empire, said about this: "I bet my life, the Inca never had that flag, it never existed, no chronicler mentioned it". The National Academy of Peruvian History has stated on the topic: "The official use of the wrongly called 'Tawantinsuyu flag' is a mistake. In the pre-Hispanic Andean world the concept of flags did not exist, it did not belong to their historic context". The rainbow Pride flag
8610-494: The Joint Chiefs of Staffs website Publication, "Integration of nuclear weapons employment with conventional and special operations forces is essential to the success of any mission or operation." Because they are weapons of mass destruction, the proliferation and possible use of nuclear weapons are important issues in international relations and diplomacy. In most countries, the use of nuclear force can only be authorized by
8733-454: The LGBT community that it is being disassociated "as a symbol of LGBT equality" and may lead to the erasure of identity. Flag A flag is a piece of fabric (most often rectangular) with distinctive colours and design. It is used as a symbol , a signalling device, or for decoration. The term flag is also used to refer to the graphic design employed, and flags have evolved into
8856-503: The Nuclear Age (1961) that mere possession of a nuclear arsenal was enough to ensure deterrence, and thus concluded that the spread of nuclear weapons could increase international stability . Some prominent neo-realist scholars, such as Kenneth Waltz and John Mearsheimer , have argued, along the lines of Gallois, that some forms of nuclear proliferation would decrease the likelihood of total war , especially in troubled regions of
8979-664: The USAAF detonated a plutonium implosion-type fission bomb nicknamed " Fat Man " over the Japanese city of Nagasaki . These bombings caused injuries that resulted in the deaths of approximately 200,000 civilians and military personnel . The ethics of these bombings and their role in Japan's surrender are to this day, still subjects of debate . Since the atomic bombings of Hiroshima and Nagasaki , nuclear weapons have been detonated over 2,000 times for testing and demonstration. Only
9102-777: The USAF AIR-2 Genie , the AIM-26 Falcon and US Army Nike Hercules . Missile interceptors such as the Sprint and the Spartan also used small nuclear warheads (optimized to produce neutron or X-ray flux) but were for use against enemy strategic warheads. Other small, or tactical, nuclear weapons were deployed by naval forces for use primarily as antisubmarine weapons. These included nuclear depth bombs or nuclear armed torpedoes. Nuclear mines for use on land or at sea are also possibilities. The system used to deliver
9225-588: The United Kingdom (see image of the Embassy flag ) and the Kingdom of Thailand (see image of the Embassy flag ). The socialist movement uses red flags to represent their cause. The anarchist movement has a variety of different flags, but the primary flag associated with them is the black flag . In the Spanish Civil War , the anarchists used the red-and-black bisected flag. In the 20th century,
9348-527: The United States against the Japanese cities of Hiroshima and Nagasaki in 1945 during World War II . Nuclear weapons have only twice been used in warfare, both times by the United States against Japan at the end of World War II . On August 6, 1945, the United States Army Air Forces (USAAF) detonated a uranium gun-type fission bomb nicknamed " Little Boy " over the Japanese city of Hiroshima ; three days later, on August 9,
9471-526: The United States. Small, two-man portable tactical weapons (somewhat misleadingly referred to as suitcase bombs ), such as the Special Atomic Demolition Munition , have been developed, although the difficulty of combining sufficient yield with portability limits their military utility. Nuclear warfare strategy is a set of policies that deal with preventing or fighting a nuclear war. The policy of trying to prevent an attack by
9594-490: The alphabet. Each flag or pennant has a specific meaning when flown individually. As well, semaphore flags can be used to communicate on an ad hoc basis from ship to ship over short distances. Another category of maritime flag flown by some United States government ships is the distinctive mark . Although the United States Coast Guard has its own service ensign, all other U.S. government ships fly
9717-485: The chance of a successful missile defense . Today, missiles are most common among systems designed for delivery of nuclear weapons. Making a warhead small enough to fit onto a missile, though, can be difficult. Tactical weapons have involved the most variety of delivery types, including not only gravity bombs and missiles but also artillery shells, land mines , and nuclear depth charges and torpedoes for anti-submarine warfare . An atomic mortar has been tested by
9840-524: The city of Cusco . In 2007, the municipality decided to modify the flag design so that it would not be confused with the Gay Pride flag. The new flag design was implemented in 2021. In Ecuador, a rainbow emblem is used by the Pachakutik political party (1995), which is composed mostly of left-wing indigenous people. A seven-striped rainbow flag design is used in Peru , Bolivia and Ecuador as
9963-625: The colors used in a past Armenian kingdom. The artist used muted, richer colors reflecting Armenian fabrics and carpets. A seven-colour rainbow flag is a common symbol of the international cooperative movement. The rainbow flag has been the cooperative emblem since 1921 when the International Co-operative Congress of World Co-op Leaders met in Basel, Switzerland to identify and define the growing cooperative movement's common values and ideals to help unite co-ops around
10086-532: The control of Nana Olomu during the conflict in the late 19th century. One is the flag generally known as the Benin Empire flag and one is referred to as Nana Olomu's flag. Among international flags are the United Nations , Europe , Olympic , NATO and Paralympic flags . Flags are particularly important at sea, where they can mean the difference between life and death, and consequently where
10209-435: The creation of nuclear fallout than fission reactions, but because all thermonuclear weapons contain at least one fission stage, and many high-yield thermonuclear devices have a final fission stage, thermonuclear weapons can generate at least as much nuclear fallout as fission-only weapons. Furthermore, high yield thermonuclear explosions (most dangerously ground bursts) have the force to lift radioactive debris upwards past
10332-455: The decision process. The prospect of mutually assured destruction might not deter an enemy who expects to die in the confrontation. Further, if the initial act is from a stateless terrorist instead of a sovereign nation, there might not be a nation or specific target to retaliate against. It has been argued, especially after the September 11, 2001, attacks , that this complication calls for
10455-399: The design of their own flags. Some prominent examples include: National flag designs are often used to signify nationality in other forms, such as flag patches . A civil flag is a version of the national flag that is flown by civilians on non-government installations or craft. The use of civil flags was more common in the past, in order to denote buildings or ships that were not crewed by
10578-469: The energy of a fission bomb to compress and heat fusion fuel. In the Teller-Ulam design , which accounts for all multi-megaton yield hydrogen bombs, this is accomplished by placing a fission bomb and fusion fuel ( tritium , deuterium , or lithium deuteride ) in proximity within a special, radiation-reflecting container. When the fission bomb is detonated, gamma rays and X-rays emitted first compress
10701-567: The extended " LGBTQ " ( lesbian , gay , bisexual and transgender ) community. In 1994, for the 25th anniversary of the Stonewall riots in New York city, a mile-long rainbow flag was created by Baker which he later cut into sections that were distributed around the world. The flag was originally created with eight colors, but pink and turquoise were removed for production purposes, and since 1979 it has consisted of six colored stripes. It
10824-399: The face of a foreign warship traditionally indicates a willingness to fight, with cannon , for the right to do so. As of 2009 , this custom is still taken seriously by many naval and port authorities and is readily enforced in many parts of the world by boarding, confiscation and other civil penalties. In some countries yacht ensigns are different from merchant ensigns in order to signal that
10947-455: The fission bomb core. The external method of boosting enabled the USSR to field the first partially thermonuclear weapons, but it is now obsolete because it demands a spherical bomb geometry, which was adequate during the 1950s arms race when bomber aircraft were the only available delivery vehicles. The detonation of any nuclear weapon is accompanied by a blast of neutron radiation . Surrounding
11070-400: The flag is turned upside down. Bulgaria's flag is also turned upside down during times of war. These are also considered war flags, though the terminology only applies to the flag's military usage. Large versions of the war flag flown on the warships of countries' navies are known as battle ensigns . In addition, besides flying the national standard or a military services' emblem flag at
11193-420: The fusion fuel, then heat it to thermonuclear temperatures. The ensuing fusion reaction creates enormous numbers of high-speed neutrons , which can then induce fission in materials not normally prone to it, such as depleted uranium . Each of these components is known as a "stage", with the fission bomb as the "primary" and the fusion capsule as the "secondary". In large, megaton-range hydrogen bombs, about half of
11316-535: The globe, would make all life on the planet extinct. In connection with the Strategic Defense Initiative , research into the nuclear pumped laser was conducted under the DOD program Project Excalibur but this did not result in a working weapon. The concept involves the tapping of the energy of an exploding nuclear bomb to power a single-shot laser that is directed at a distant target. During
11439-484: The idea of the 'mobile' flag in which an individual displays their particular flag of choice on their vehicle. These items are commonly referred to as car flags and are usually manufactured from high strength polyester material and are attached to a vehicle via a polypropylene pole and clip window attachment. In Australia, Canada, New Zealand, the Philippines, Ireland and the United Kingdom, a pair of red-yellow flags
11562-496: The majority of their energy from nuclear fission reactions alone, and those that use fission reactions to begin nuclear fusion reactions that produce a large amount of the total energy output. All existing nuclear weapons derive some of their explosive energy from nuclear fission reactions. Weapons whose explosive output is exclusively from fission reactions are commonly referred to as atomic bombs or atom bombs (abbreviated as A-bombs ). This has long been noted as something of
11685-407: The midst of the Cold War. It highlighted the dangers posed by nuclear weapons and called for world leaders to seek peaceful resolutions to international conflict. The signatories included eleven pre-eminent intellectuals and scientists, including Albert Einstein , who signed it just days before his death on April 18, 1955. A few days after the release, philanthropist Cyrus S. Eaton offered to sponsor
11808-545: The military establishment have questioned the usefulness of such weapons in the current military climate. According to an advisory opinion issued by the International Court of Justice in 1996, the use of (or threat of use of) such weapons would generally be contrary to the rules of international law applicable in armed conflict, but the court did not reach an opinion as to whether or not the threat or use would be lawful in specific extreme circumstances such as if
11931-560: The military. In some countries the civil flag is the same as the war flag or state flag , but without the coat of arms, such as in the case of Spain , and in others it is an alteration of the war flag. Several countries, including the Royal Air Force , British Army and the Royal Navy ( White Ensign ) of the United Kingdom and the Soviet Union have had unique flags flown by their armed forces separately, rather than
12054-408: The missiles before they land or implementing civil defense measures using early-warning systems to evacuate citizens to safe areas before an attack. Weapons designed to threaten large populations or to deter attacks are known as strategic weapons . Nuclear weapons for use on a battlefield in military situations are called tactical weapons . Critics of nuclear war strategy often suggest that
12177-573: The more recent Sultanate of Muscat and Oman , whose flags were both a plain field of red. Colours are normally described with common names, such as "red", but may be further specified using colourimetry . The largest flag flown from a flagpole worldwide, according to Guinness World Records, is the flag of the United Arab Emirates flown in Sharjah . This flag was 2,448.56 m (26,356.1 sq ft). The largest flag ever made
12300-610: The national ensign as their service ensign, following United States Navy practice. To distinguish themselves from ships of the Navy, such ships historically have flown their parent organisation's flag from a forward mast as a distinctive mark. Today, for example, commissioned ships of the National Oceanic and Atmospheric Administration (NOAA) fly the NOAA flag as a distinctive mark. Flags are usually rectangular in shape (often in
12423-437: The peak of the sailing age , beginning in the early 17th century, it was customary (and later a legal requirement) for ships to fly flags designating their nationality; these flags eventually evolved into the national flags and maritime flags of today. Flags also became the preferred means of communications at sea, resulting in various systems of flag signals; see, International maritime signal flags . Use of flags beyond
12546-469: The power of light, enlightenment and progress. The first co-op rainbow flag was completed in 1924 and was adopted as an official symbol of the international cooperative movement in 1925. In 2001, the ICA 's official flag was changed from a rainbow flag to a rainbow logo flag on a white field, to clearly promote and strengthen the cooperative image, but still use the rainbow image. Other organizations sometimes use
12669-459: The ratio 2:3, 1:2, or 3:5), but may be of any shape or size that is practical for flying, including square, triangular, or swallow tailed. A more unusual flag shape is that of the flag of Nepal , which is in the shape of two stacked triangles. Other unusually shaped flags include the civil flags of Ohio (a swallowtail ); Tampa, Florida ; and Pike County, Ohio . Many flags are dyed through and through to be inexpensive to manufacture, such that
12792-428: The remains of the split atomic nuclei. Many fission products are either highly radioactive (but short-lived) or moderately radioactive (but long-lived), and as such, they are a serious form of radioactive contamination . Fission products are the principal radioactive component of nuclear fallout . Another source of radioactivity is the burst of free neutrons produced by the weapon. When they collide with other nuclei in
12915-505: The rest of the world. Since 1978, when it was created to represent gay pride , the rainbow pride flag has evolved as a symbol of the LGBT movement (in 1978, the community as a whole was referred to and described as the "Gay" community; the term "LGBT" did not yet exist.) There are several independent rainbow flags in use today. The reformer Thomas Müntzer (1489–1525) connected socially revolutionary claims with his religious preaching ( Genesis 9:11-17 , Isaiah 40:8 , 1 Peter 1:25 ). He
13038-415: The reverse side is the mirror image of the obverse (front) side, generally the side displayed when, from the observer's point of view, the flag flies from pole-side left to right. This presents two possibilities: Some complex flag designs are not intended to be shown on both sides, requiring separate obverse and reverse sides if made correctly. In these cases there is a design element (usually text) which
13161-412: The rules and regulations for the flying of flags are strictly enforced. A national flag flown at sea is known as an ensign . A courteous, peaceable merchant ship or yacht customarily flies its ensign (in the usual ensign position), together with the flag of whatever nation it is currently visiting at the mast (known as a courtesy flag ). To fly one's ensign alone in foreign waters, a foreign port or in
13284-514: The standard horizontal flag in central and eastern Europe, particularly in the German-speaking countries. This practice came about because the relatively brisk wind needed to display horizontal flags is not common in these countries. The standard horizontal flag (no. 1 in the preceding illustration) is nonetheless the form most often used even in these countries. The vertical flag (German: Hochformatflagge or Knatterflagge ; no. 2)
13407-410: The stripes and the seventh (light blue) colour. The Tokyo Metropolitan Government issued the "Thorough Infection Prevention Declaration Sticker" for the purpose of working on the infection spread prevention guidelines for businesses formulated by the metropolitan government. In the media, it is also known as the rainbow sticker. A checklist that businesses should take to prevent the spread of infection
13530-402: The surrounding material, the neutrons transmute those nuclei into other isotopes, altering their stability and making them radioactive. The most commonly used fissile materials for nuclear weapons applications have been uranium-235 and plutonium-239 . Less commonly used has been uranium-233 . Neptunium-237 and some isotopes of americium may be usable for nuclear explosives as well, but it
13653-498: The survival of the state were at stake. Another deterrence position is that nuclear proliferation can be desirable. In this case, it is argued that, unlike conventional weapons, nuclear weapons deter all-out war between states, and they succeeded in doing this during the Cold War between the U.S. and the Soviet Union . In the late 1950s and early 1960s, Gen. Pierre Marie Gallois of France, an adviser to Charles de Gaulle , argued in books like The Balance of Terror: Strategy for
13776-423: The traditional rainbow flag as a symbol of cooperation. Like the rainbow , this flag is a symbol of hope and peace. The seven colours from flags around the world fly in harmony. Each of the seven colours in the co-operative flag have been assigned the following meaning: The ICA has been flying a flag with its official logo since April 2001, when its Board decided to replace the traditional rainbow flag. Its use by
13899-446: The weapon system and difficult to defend against the delivery of the weapon during a potential conflict. This can mean keeping weapon locations hidden, such as deploying them on submarines or land mobile transporter erector launchers whose locations are difficult to track, or it can mean protecting weapons by burying them in hardened missile silo bunkers. Other components of nuclear strategies included using missile defenses to destroy
14022-631: The world where there exists a single nuclear-weapon state. Aside from the public opinion that opposes proliferation in any form, there are two schools of thought on the matter: those, like Mearsheimer, who favored selective proliferation, and Waltz, who was somewhat more non- interventionist . Interest in proliferation and the stability-instability paradox that it generates continues to this day, with ongoing debate about indigenous Japanese and South Korean nuclear deterrent against North Korea . The threat of potentially suicidal terrorists possessing nuclear weapons (a form of nuclear terrorism ) complicates
14145-516: The world. In Essen, Germany in 1922, the International Co-operative Alliance (ICA) designed an international co-op symbol and a flag for the first "Co-operators' Day," which was held in July 1923. After some experiments with different designs, a famous French cooperator, Charles Gide , suggested using the seven colours of the rainbow for the flag. He pointed out that the rainbow symbolized unity in diversity and
14268-459: The yacht is not carrying cargo that requires a customs declaration. Carrying commercial cargo on a boat with a yacht ensign is deemed to be smuggling in many jurisdictions. Traditionally, a vessel flying under the courtesy flag of a specific nation, regardless of the vessel's country of registry, is considered to be operating under the law of her 'host' nation. There is a system of international maritime signal flags for numerals and letters of
14391-624: The yield comes from the final fissioning of depleted uranium. Virtually all thermonuclear weapons deployed today use the "two-stage" design described to the right, but it is possible to add additional fusion stages—each stage igniting a larger amount of fusion fuel in the next stage. This technique can be used to construct thermonuclear weapons of arbitrarily large yield. This is in contrast to fission bombs, which are limited in their explosive power due to criticality danger (premature nuclear chain reaction caused by too-large amounts of pre-assembled fissile fuel). The largest nuclear weapon ever detonated,
14514-542: Was annexed with separate flags containing additional colors representing individual segments of the LGBT community: in 2017, a collaboration between the Philadelphia Office of LGBT Affairs and the Tierney Agency added a brown and a black stripe at the top of the Pride flag to symbolize black and brown people of color, naming the design the "More Color, More Pride" (aka "Philly Pride") flag; and in 2018,
14637-558: Was just the silk itself, later fashioned by people who had independently conceptualized a rectangular cloth attached to a pole. Flags were probably transmitted to Europe via the Muslim world , where plainly coloured flags were used due to Islamic proscriptions . They are often mentioned in the early history of Islam and may have been copied from India. In Europe, during the High Middle Ages , flags came to be used primarily as
14760-431: Was popularized as a symbol of the gay community by San Francisco artist Gilbert Baker in 1978. The different colors are often associated with "diversity" in the gay community , but actually have symbolic meanings. The flag is used predominantly at LGBT pride events and in gay villages worldwide in various forms including banners, clothing and jewelry. Since the 1990s, its symbolism has been transferred to represent
14883-744: Was the Special Atomic Demolition Munition , or SADM, sometimes popularly known as a suitcase nuke . This is a nuclear bomb that is man-portable, or at least truck-portable, and though of a relatively small yield (one or two kilotons) is sufficient to destroy important tactical targets such as bridges, dams, tunnels, important military or commercial installations, etc. either behind enemy lines or pre-emptively on friendly territory soon to be overtaken by invading enemy forces. These weapons require plutonium fuel and are particularly "dirty". They also demand especially stringent security precautions in their storage and deployment. Small "tactical" nuclear weapons were deployed for use as antiaircraft weapons. Examples include
15006-539: Was the flag of Qatar ; the flag, which measures at 101,978 m (1,097,680 sq ft), was completed in December 2013 in Doha . The general parts of a flag are: canton (the upper inner section of the flag), field or ground (the entire flag except the canton), the hoist (the edge used to attach the flag to the hoist), and the fly (the furthest edge from the hoist end). Vertical flags are sometimes used in lieu of
15129-590: Was the flag of the Netherlands, which appeared during the 80-year Dutch rebellion which began in 1568 against Spanish domination. Political change and social reform, allied with a growing sense of nationhood among ordinary people, led to the creation of new nations and flags all over the world in the 19th and 20th centuries. One of the most popular uses of a flag is to symbolise a nation or country . Some national flags have been particularly inspirational to other nations, countries, or subnational entities in
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