Jedi beacon/Legends

"This is Supreme Chancellor Palpatine. The war is over. I repeat, the war is over. All Jedi are ordered to return to the Jedi Temple immediately. You will receive futher instructions when you arrive."

- The newly elected Emperor Palpatine.

The Jedi beacon was a way to contact all Jedi throughout the Galaxy. The Jedi Council could program a mass signal broadcast, or a single message to one ship. In addition to the Temple's computer, each ship carried a small computer capable of sending out messages to other Jedi in the field.