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Coin flipping, coin tossing, or heads or tails is the practice of throwing a coin in the air to choose between two alternatives, sometimes to resolve a dispute between two parties. It is a form of sortition which inherently has only two possible and equally likely outcomes. ==History== The historical origin of coin flipping is the interpretation of a chance outcome as the expression of divine will. Coin flipping as a game 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.〔 〕 In England, this game was referred to as ''cross and pile''.〔〔 〕 The expression ''Heads or Tails'' results from heads and tails being considered opposite body parts. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「coin flipping」の詳細全文を読む スポンサード リンク
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