Crossbow bolt

An unusually small crossbow bolt with a tapered "waist" shaft section and rear skirt compared to a 1 euro cent coin

A bolt or quarrel is a dart-like projectile used by crossbows. The word quarrel is from the Old French quarrel (> French carreau) "square thing", 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.