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Green is for six months of sobriety; purple is for nine months. A sobriety coin is a token given to Alcoholics Anonymous or other twelve-step program members representing the amount of time the member has remained sober. It is traditionally a medallion the size of a poker chip, 34 mm (1.34 in) (standard) or 39 mm (1.5 in) in diameter.
Bertrand's box paradox is a veridical paradox in elementary probability theory. It was first posed by Joseph Bertrand in his 1889 work Calcul des Probabilités . There are three boxes: a box containing two gold coins, a box containing two silver coins, a box containing one gold coin and one silver coin. Choose a box at random.
The Chinese Gold Panda ( simplified Chinese: 熊猫金币; traditional Chinese: 熊貓金幣; pinyin: xióng māo jīn bì) is a series of gold bullion coins issued by the People's Republic of China. The Official Mint of the People's Republic of China introduced the panda gold bullion coins in 1982. [ 1] The panda design changes every year ...
A double eagle is a gold coin of the United States with a denomination of $20. [1] (Its gold content of 0.9675 troy ounces [30.09 g] was worth $20 at the 1849 official price of $20.67/ozt.) The coins are 34 mm × 2 mm and are made from a 90% gold (0.900 fine or 21.6 kt) and 10% copper alloy and have a total weight of 1.0750 troy ounces (1.1794 ...
1908. The Indian Head gold pieces or Pratt-Bigelow gold coins were two separate coin series, identical in design, struck by the United States Mint: a two-and-a-half-dollar piece, or quarter eagle, and a five-dollar coin, or half eagle. The quarter eagle was struck from 1908 to 1915 and from 1925–1929. The half eagle was struck from 1908 to ...
A gold coin is a coin that is made mostly or entirely of gold. Most gold coins minted since 1800 are 90–92% gold (22‑ karat ), while most of today's gold bullion coins are pure gold, such as the Britannia, Canadian Maple Leaf, and American Buffalo. Alloyed gold coins, like the American Gold Eagle and South African Krugerrand, are typically ...
Gold certificate (United States) Gold certificates were issued by the United States Treasury as a form of representative money from 1865 to 1933. While the United States observed a gold standard, the certificates offered a more convenient way to pay in gold than the use of coins. General public ownership of gold certificates was outlawed in ...
The Libertad coins are silver and gold bullion coins originating from Mexico and minted by the La Casa de Moneda de México (Mexican Mint). The Mexican Mint was established in 1535 and is the oldest mint in the Americas. The modern coins contain 99.9% silver or gold (.999 fineness) and are available in various sizes.