The term "pirate flag" can be replaced by several synonyms that denote the black flag with a white skull and crossed bones that is commonly associated with pirates. Some of these synonyms include Jolly Roger, black jack, black banner, death flag, and skull flag. In addition, pirates were known to use variations of the traditional black flag, such as red or white flags with a black skull and crossbones. These flags were used to intimidate and strike fear into their victims, and the use of the Jolly Roger remains a popular symbol of piracy today.