Section chief

A section chief was the leader of a section on Starfleet starships.

In 2266, the "good" half of James T. Kirk ordered section chiefs on the USS Enterprise (NCC-1701) to assign personnel to the search for his "evil" half, and to report to Mr. Spock. 

In 2369, a crewmember of USS Enterprise (NCC-1701-D) announced that all science personnel were to check in with their section chiefs to learn what their duties would be on the Remmler Array for the duration of a baryon sweep of the Enterprise.