The Jolly Roger is a pirate flag. 

The Jolly Roger is a famous pirate flag. 

Pirates used flags to talk to other ships. A black flag meant the ship could surrender. This helped people stay safe. If the pirates raised a red flag, they would not show mercy. 
Pirates did not fly the flag all the time. They often used a different flag first. This helped them get close to other ships. It was a way to send a signal on the sea. The Jolly Roger is a very famous symbol.
The Jolly Roger is a famous pirate flag. 

Pirates used flags to send signals at sea. They did not fly the Jolly Roger all the time. They often used a false flag to get close to other ships. This helped them get within range to attack. When they were ready, they would raise the Jolly Roger.
A black flag was a signal for mercy. It meant a ship could surrender its goods. If the ship surrendered, the pirates would show quarter. This means they would show mercy to the crew. 
Pirates also used a red flag. This was called a bloody flag. It signaled that no mercy would be shown. The pirates would take everything by force. This was a very serious signal for other sailors.
The Jolly Roger is a famous name for pirate flags. 

Flags were used as important signals during an attack. Pirates did not fly the Jolly Roger all the time. They often used a false flag to get close to a target. This allowed them to get within firing range without being noticed. Once they were close, they would raise their real flag. They might also fire a warning shot at the same time. This told the other ship that the pirates were ready. 
There were different rules for different colored flags. A black flag was a signal for mercy. It meant that "quarter" would be given to the crew. If a ship surrendered its goods, the pirates would show mercy. To signal surrender, a ship had to "strike its flag." This meant taking down its own flag to show it gave up. 
Pirates also used a red flag, sometimes called a "bloody flag." This was a very serious signal for other sailors. It meant that "no quarter" would be given to anyone. The pirates would take the cargo by force. In this case, no mercy would be shown to the people on the target ship. Some captains would wait for the enemy to fire shots before attacking. 
History shows that many different designs existed. Captain Francis Spriggs used a white skeleton with a dart and an hourglass. 

The Jolly Roger is the famous name for the flags flown by pirate ships. 

Pirates used these flags through a specific system of signaling. They did not fly the Jolly Roger at all times. Instead, they often used a false flag or no flag at all. This allowed them to approach a target ship without being recognized. Once the pirate ship was within firing range, they would raise their true colors. They might also fire a warning shot to get the target's attention. 
Color played a major role in the messages these flags sent. The black flag, or the Jolly Roger, signaled that "quarter" would be given. This meant the pirates promised mercy if the target surrendered their cargo and valuables. However, pirates also used a red flag, often called a "bloody flag." 
There were many different designs for these flags throughout history. The most common version today is the skull and crossbones on a black field. This is sometimes called the "Death's Head" flag. However, other captains used very different symbols. Captain Francis Spriggs used a black ensign featuring a white skeleton. This skeleton held a dart in one hand striking a bleeding heart and an hourglass in the other. 
Historical records show how these designs evolved over time. The term "Jolly Roger" first appeared in print in Charles Johnson's 1724 book, *A General History of the Pyrates*. Johnson noted that pirates like Bartholomew Roberts and Francis Spriggs used the name. Because their flags looked so different, historians believe "Jolly Roger" was a general name for black pirate flags. The skull and crossbones design became the standard look by about 1730. Before this, many pirates were actually privateers. These were legal sailors who flew specific flags, like the 1606 Union Jack with a white crest, to distinguish themselves from the Royal Navy.
Some theories exist about where the name "Jolly Roger" comes from, though they lack historical proof. One idea is that it comes from the French phrase "Joli Rouge," meaning "Pretty Red." This might refer to the red flags used by French privateers. Another theory suggests it is a phonetic version of the name "Ali Rajah," a supposed Indian pirate. Historians discount these ideas because there are no period references to support them. Another possible connection is to the term "Old Roger," which was a nickname for the devil or death. A 1723 news report described pirates using a flag called "Old Roger" that featured a skeleton with an hourglass and a dart.
Understanding the Jolly Roger helps us see how maritime communication worked. It was a system built on the necessity of the era. In the age of sail, there was no other way to approach an enemy without being seen. The flags provided a clear, visual way to manage the risks of sea combat. They allowed for a choice between peaceful surrender and violent conflict. This system of black and red flags was part of a broader naval tradition of using colored signals to communicate intent and status on the high seas.
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