Jedi flash code

The Jedi flash code served as a communication technique that depended on sporadic sounds. The New Jedi Order employed it, and in the year 44 ABY, Grand Master Luke Skywalker transmitted a clandestine communication to the Jedi Temple located on the planet Coruscant. He accomplished this by utilizing Jedi flash code, tapping it into the mike situated at the navigator's console on the Lost Tribe of Sith starship known as the Emiax.