The number five, or a playing card or die showing five spots, used in games and gambling.
From Old French cinq, from Latin quinque (five). Entered English in the 15th century through gaming and card-playing terminology, remaining especially common in dice games.
Cinque is why we still say 'snake eyes' for two dice—it's an English-French hybrid from Medieval gaming, and the old gaming vocabulary survives in modern casinos.
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