Because each pirate flew under thier own code, their own, laws, and their own standard. They were virtually their own mobile nation, so they had to have different flags. Also that way they could spread their own infamy, because the people they raided (if any survived) would all know who did it.
A red flag.
The flag generally associated with pirates in the 17th and 18th centuries is known as the "Jolly Roger." This flag typically features a skull and crossbones, symbolizing danger and death, and was used to intimidate victims. Variations of the Jolly Roger existed, with some pirates incorporating different symbols or colors to represent their individual crews.
jolly roger
The jolly Rodger.
Surrender was expeted.
The jolly roger.
Merchant flag: Storm the town merchants (Swashbuckler)
The British flag and the American flag (as well as the French and the Russian flags) all use the same 3 colors, red, white, and blue. But the patterns are different.
No, a jolly roger is a pirates flag.
All boats have flags telling who they are ( that is even true today) and in the open sea it is was impossible to tell what or who the other ship was without a flag. There was no means to contact the ship you saw and no way to know who they were. The flag told the story of the ship facing you.
The only flag on the Moon is the United State's flag.
different pirates speak different laguages.