An atomic clock is a time keeping device.

• Atomic Clock Ensemble in Space science project
• a clock updated by radio signals which is sometimes called an "atomic clock" Radio clock
• the clock as a measure for risk of catastrophic destruction Doomsday Clock

• Atomic Clock, nickname of Zimmers Hole drummer Gene Hoglan
• Atomic Clock (musician), solo name of The Earlies keyboardist Giles Hatton

Songs

• "Atomic Clock", a song by Mark Helias
• "Atomic Clock", a song by Monster Magnet from Powertrip

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