Official One Piece Jolly Rogers
The Jolly Roger ( ドクロ , Dokuro ? ) , also known as a Pirate Flag ( 海賊旗 , Kaizoku-ki ? ) is the traditional flag of European and Caribbean pirates , envisioned today as a skull over crossed thigh bones on a black field. Various versions of the Jolly Roger existed over the course of the centuries; for example, Calico Jack's Jolly Roger replaced the thigh bones with swords ( cutlasses ).