The small flat face at the bottom point of a cut diamond, or the bottom edge of armor that protects the upper thigh and buttocks.
From French 'culet,' diminutive of 'cul' meaning 'bottom' from Latin 'culus.' In diamond cutting, it refers to the small table at the base; in armor, it's a reinforced rear section.
Medieval knights wore culets specifically because arrows and sword strikes often came from the back during chaotic battles—your rear end is just as vulnerable in combat!
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