Stock footage
Stock footage is previously existing footage that is either in the public domain, or is re-used from prior Star Trek episodes and movies. It is frequently used in Star Trek productions for shots of starships flying, starbase exteriors, crowd scenes, and historical videos.

One well-known example of re-using Star Trek footage in multiple episodes is a Star Trek: The Original Series reaction shot featuring Hikaru Sulu turning around in his chair.

Starships
  (re-used as )
Production material