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A bolt or quarrel is a dart-like projectile used by crossbows.[1] The word quarrel is from the Old French quarrel (> French carreau) "square thing",[2] specialized use as quarrel d'arcbaleste (> carreau d'arbalète) "crossbow quarrel", referring to their typically square heads. Although their lengths vary, bolts are typically shorter and heavier than traditional arrows shot with longbows.[3]