Ultra Saiyan
DBZ Manga Chapter 385 - Ultra Trunks
Future Trunks powers up into an Ultra Saiyan in the manga.
Type Physical
User(s) Future Trunks; Goku

Ultra Saiyan is a sub-form of Super Saiyan. Like the other previous-form, it isn't technically a different transformation itself. It greatly increases muscle mass, to the point that it weighs the user down and reduces their speed. In Future Trunks' case, it also makes his hair much more spiked.