Pirate flags, often known as "Jolly Roger," were used by pirates to identify themselves and instill fear in their targets. These flags typically featured a skull and crossbones, symbolizing death and danger. The design varied among different pirate crews, with some using unique symbols to represent their identity or reputation. The use of pirate flags dates back to the 17th century, during the Golden Age of Piracy. These flags served both practical and psychological purposes, signaling that a ship was a pirate vessel. When a pirate ship raised its flag, it often meant that surrender or battle was imminent.