The TIE Fighter is the original design for later upgraded TIE models such as TIE/sa bomber, TIE/IN
interceptor, TIE/D Defender, TIE/D automated starfighter, and many more. The TIE Fighter was a descendant of the T.I.E. starfighter and the V-wing starfighter, both developed for the Galactic Republic, and was manufactured by Sienar Fleet Systems. In addition to the TIE and V-wing, it was also descended from the TIE starfighter, the first TIE model developed for the Galactic Empire. The namesake for the fighter and line was the Sienar Fleet Systems P-s4 twin ion engines that acted as its engines. However, it also to some degree was named after an item of clothing due to its overall shape resembling a bow-tie.