The term 'Enterprise Speed Unit' is a reference to the WARP Drive technology used in the Star Trek franchise. WARP Drive is a form of faster-than-light propulsion that allows starships to travel at speeds greater than the speed of light. This technology was first introduced in the original series and has been featured in all subsequent series and films. WARP Drive is powered by a WARP core, which is a type of energy reactor. The Enterprise Speed Unit is a measure of the speed of a starship when using WARP Drive.