Jolly Rogers in One Piece symbolizes a crew's identity & captain's personality. The design communicates the crew's beliefs, like freedom for Straw Hats. Losing a Jolly Roger is like losing a crew ...

This was the first time a submarine flew the Jolly Roger flag, but it wouldn't be ... For a while submarines would display ...

so the collection of flags flown from the top of the conning tower soon became numerous, so that practice was swapped – with a submarine flying one single large Jolly Roger flag, with symbols ...