Clock

A clock is a piece of equipment used to track the passage of time.

Clocks were used onboard starships in the form of chronometers. (TOS episode: The Naked Time, et al.)

Under the influence of an ancient Saltah'na device Benjamin Sisko once built a complex bronze clock of Saltah'na design. (DS9 episode: Dramatis Personae; novel: Devil in the Sky)