Definition that contains skull and crossbones
- blackjack a flag usually bearing a white skull and crossbones on a black background; indicates a pirate ship
- jolly roger a flag usually bearing a white skull and crossbones on a black background; indicates a pirate ship
- pirate flag a flag usually bearing a white skull and crossbones on a black background; indicates a pirate ship
- black flag a flag usually bearing a white skull and crossbones on a black background; indicates a pirate ship