Propulsion matrix
The propulsion matrix was a key component of a starship's propulsion system, and could vary from species to species.

In 2154, when Valdore was attempting to convince Senator  that the Romulan drone ship was untraceable – Vrax noted that the Vulcans would be able to trace it to the Romulan Star Empire the minute they scanned the propulsion matrix. ()

The  was able to knock out a Borg cube's main propulsion system by attacking its propulsion matrix in 2376. ()
Propulsion technology