Echo Three was a callsign used by the Alliance to Restore the Republic.
During the Galactic Civil War, an Echo Squadron pilot using this callsign participated in the battle at Fostar Haven against Imperial forces.
During the Rebel Alliance's time in Echo Base on the ice planet Hoth, Commander Luke Skywalker used this callsign while scouting for lifeforms in the frozen wastes.
Echo Three was the callsign of a Rebel Alliance non-player character in the 2020 video game Star Wars: Squadrons.