Bearing the crossbones emblem. / (snowboarding) Having the back leg boned while the front hand holds part of the foot

A representation of two femurs (thighbones) crossed diagonally, chiefly combined with a human skull as a symbol of danger or death.

plural of skull and crossbones

plural of skull-and-crossbones (alternative form of skulls and crossbones)

Alternative form of skull and crossbones

A depiction of a human skull and two crossed femurs (thighbones), a symbol of death traditionally used on the Jolly Roger pirate flag, but now as a warning of toxicity or other dangers.