Sigma

Sigma was a letter in the Secondary alternate alphabet. Sigma was often used as a call sign for Imperial starships, often transports such as the Delta-class DX-9 stormtrooper transport. Transport Signma 1 is one such example.

Appearances

 * ''Star Wars: X-wing
 * Star Wars: TIE Fighter
 * Star Wars: X-wing vs. TIE Fighter
 * Star Wars: X-wing Alliance