Sigma

Sigma was a letter in the Tionese alphabet. Sigma was often used as a call sign for Imperial starships, often transports such as the Delta-class DX-9 stormtrooper transport. Transport Sigma 1 and Sigma Squadron of TIE Phantoms are such examples.
==Appearances==
*Star Wars: X-Wing 
*Star Wars: TIE Fighter
*Star Wars: X-Wing Alliance
*Star Wars: X-Wing vs. TIE Fighter
*Star Wars: Rebel Assault II: The Hidden Empire
Category:Writing