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Coin flipping
Coin flipping, coin tossing, or heads or tails involves launching a coin in the air and then checking which side is showing once it has landed, in order to randomly choose between two alternatives. It is a form of sortition which inherently has two possible outcomes. Used in such a fashion, the coin serves as a binary lot. History and nomenclatureCoin flipping was known to the Romans as navia aut caput ("ship or head"), as some coins had a ship on one side and the head of the emperor on the other.
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