Engineering rating
An engineering rating was a type of rating used by Starfleet in at least the late-24th century to quantify the  skills and experience that a crewmember possessed. Starfleet maintained at least four levels for measuring one's engineering rating.

In 2374, Chief Engineer B'Elanna Torres requested that any personnel aboard the  with an engineering rating of three or higher to help in removing Borg armor from the starship's hull. ()

de:Technischer Dienstgrad
Measurements