- "You always hear them first. Twin ion engines make TIE fighters howl as they fly by on patrols."
- ―Ezra Bridger, on TIE fighters
The twin ion engine was a type of ion engine which propelled starships in space. The sublight drive was widely incorporated into various models of starfighters. The engine was used in Sienar Fleet Systems' TIE line and made the distinct high-pitched shrieking sound they were known for.
The TIE/sk x1 experimental air superiority fighter, also known as the TIE Striker, was a model of the TIE line in service to the Galactic Empire. This atmospheric fighter's twin ion engine emmitted a blue light.