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What does 12H stand for?

12H stands for 12-Hour Clock (as opposed to 24H)

This definition appears frequently and is found in the following Acronym Finder categories:

  • Slang/chat, popular culture

Samples in periodicals archive:

A TIME MACHINE The Deep Time clock shows you just how old the Earth is by comparing the planet's history to a 12-hour clock.
pounds 80 The stripped-back Storm Elexo gives this gadget watch an 80s look, with a 12-hour clock, date and month functions, an LED-o-vision and an alarm.