The number or value of seven, or a die showing seven spots in gaming and dice.
From Latin 'hepta-' (seven, from Greek) + '-ace' (suffix used in gaming terms like 'ace'). Associated with dice games and gaming terminology.
In old gaming slang, calling out 'heptace' was like saying 'lucky seven!'—it had magical significance because seven is the most probable number when rolling two dice, so gambling odds were literally baked into the language.
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