Ship's bell
The ship's bell was a traditional Earth nautical device designed to indicate time intervals in relation to duty watches aboard a ship with the sounding of a .

In the late-23rd century, some Federation Starfleet starships had a ship's bell, with the  being an example. () In 2293, aboard the , as the ship's bell sounded, the Klingon delegation were preparing to transport back to Kronos One after dinner and General  rhetorically asked "have we not heard the chimes at midnight?" ()

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Time
Spacecraft components