Dadita
From Wookieepedia, the Star Wars wiki.
The Dadita was an old Mandalorian code transmitted in long and short tones that conveyed letters and numbers. It could be transmitted by flashing lights or banging on a metal surface.
[edit] Behind the scenes
Dadita may be based on Morse code, a similar code comprised of "dahs" and "dits" (hence the name).
