Fighting under the "Black Flag" has been part of battle lore for centuries and is really an early psy-op. It basically conveys the message "Surrender, if you resist no quarter will be given. All will be killed". The color of the flag is what's important but pirates did decorate theirs with various icons, including the skull and cross bones of the Jolly Roger.
![อาจารย์ยอด : พระเตะผี [ผี]](http://i.ytimg.com/vi/zusDOIFasaE/mqdefault.jpg)
Fighting under the "Black Flag" has been part of battle lore for centuries and is really an early psy-op. It basically conveys the message "Surrender, if you resist no quarter will be given. All will be killed". The color of the flag is what's important but pirates did decorate theirs with various icons, including the skull and cross bones of the Jolly Roger.