Flags

jack

A flag, especially one flown at the bow of a ship to indicate her nationality.


 

Jolly Roger

A pirate flag depicting a skull-and-crossbones. It was an invitation to surrender, with the implication that those who surrendered would be treated well. A red flag indicated "no quarter."

 

 
 

strike colors

To lower, specifically a ship’s flag as a signal of surrender.


Yellow Jack

A yellow flag flown to indicate the presence of an illness, often yellow fever, aboard a ship. Often the flag is used to trick pirates into avoiding potential targets.