海盗旗

[ noun ]
a flag usually bearing a white skull and crossbones on a black background; indicates a pirate ship
<noun.artifact>

Roger \Rog"er\, n. [From a proper name Roger.]
A black flag with white skull and crossbones, formerly used
by pirates; -- called also {Jolly Roger} and {pirate flag}.
[Webster 1913 Suppl. +PJC]