Lieutenant

From Hidden Frontier

A rank. Lieutenant is the Starfleet line rank immediately inferior to Lieutenant Commander. Officers at this rank typically have some command experience, and are occasionally appointed department heads on starships.

Typically they are shift commanders in a department under a Lieutenant Commander. For example, Lieutenant Commander may be chief of engineering and also commander of A shift;B and C shifts would each be overseen by a Lieutenant.

This Starfleet rank is designated on the uniform collar by two gold pips.