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  2. Japanese yen - Wikipedia

    en.wikipedia.org/wiki/Japanese_yen

    Early 1-yen coin from 1901 (Meiji year 34), 26.96 grams of 90% fine silver 20 yen coin from 1870 (Meiji year 3) In 1897, the silver 1 yen coin was demonetized and the sizes of the gold coins were reduced by 50%, with 5, 10 and 20 yen coins issued. After the war, brass 50 sen, 1 and 5 yen were introduced between 1946 and 1948.

  3. 500 yen coin - Wikipedia

    en.wikipedia.org/wiki/500_yen_coin

    These reasons have made 500 yen coins a prime choice for counterfeiters ever since they were first minted in 1982. Problems arose that year as South Korea introduced a coin worth 500 won (₩500) valued at about one tenth of the value of the 500 yen coin. [7] Both coins are made up of the same cupronickel alloy and have the same 26.5 mm ...

  4. 5 yen coin - Wikipedia

    en.wikipedia.org/wiki/5_yen_coin

    The 5-yen coin (五円硬貨, Go-en kōka) is a denomination of the Japanese yen. The current design was first minted in 1959, using Japanese characters known as the "new script" and kanji in the kaisho style, and were also minted from 1948 to 1958 using "old-script" Japanese characters in the gothic style. [1] Five-yen coins date to 1870 (when ...

  5. Coin flipping - Wikipedia

    en.wikipedia.org/wiki/Coin_flipping

    Coin flipping, coin tossing, or heads or tails is the practice of throwing a coin in the air and checking which side is showing when it lands, in order to randomly choose between two alternatives. It is a form of sortition which inherently has two possible outcomes. The party who calls the side that is facing up when the coin lands wins.

  6. Reserve currency - Wikipedia

    en.wikipedia.org/wiki/Reserve_currency

    The reserve currency can be used in international transactions, international investments and all aspects of the global economy. It is often considered a hard currency or safe-haven currency. The United Kingdom's pound sterling was the primary reserve currency of much of the world in the 19th century and first half of the 20th century. [1]

  7. Checking whether a coin is fair - Wikipedia

    en.wikipedia.org/wiki/Checking_whether_a_coin_is...

    A fair coin is an idealized randomizing device with two states (usually named "heads" and "tails") which are equally likely to occur. It is based on the coin flip used widely in sports and other situations where it is required to give two parties the same chance of winning.

  8. Foreign exchange market - Wikipedia

    en.wikipedia.org/wiki/Foreign_exchange_market

    The foreign exchange market (forex, FX (pronounced "fix"), or currency market) is a global decentralized or over-the-counter (OTC) market for the trading of currencies. This market determines foreign exchange rates for every currency. It includes all aspects of buying, selling and exchanging currencies at current or determined prices.

  9. Special drawing rights - Wikipedia

    en.wikipedia.org/wiki/Special_drawing_rights

    U.S. Dollar, Euro, Chinese Yuan, Japanese Yen, and Pound Sterling. Special drawing rights (SDRs, code XDR) are supplementary foreign exchange reserve assets defined and maintained by the International Monetary Fund (IMF). [1] SDRs are units of account for the IMF, and not a currency per se. [2] They represent a claim to currency held by IMF ...