The term 'STAR TREK SPEED FACTOR' refers to the WARP speed of a starship in the Star Trek universe. WARP speed is a faster-than-light propulsion system used by starships to travel between star systems. The solution to this crossword is WARP, which is a four-letter word. WARP speed is measured on a scale from 1 to 10, with 1 being the slowest and 10 being the fastest. WARP 10 is theoretically the maximum speed attainable, and is equivalent to infinite speed.