From publisher blurb: Jump engines are complex systems with many parts. Even one of them not working problem can cause your crew of spacefarers to be stranded in deep space or stuck on a remote world. Have a name for each and every one of those parts. d66 Jump Engine Parts names lots of these parts so you don't need to come up with a random part on the fly. 16 Dimensional shifter 35 Hydrogen magnetopump 51 Positron converter/inverter