Penguin
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An Acronym for Temps Atomique International, ie International Atomic Time.

This is a time zone measured with atomic clocks. Its reading increases monotonically, without leap seconds added. TAI is defined as the unit of duration of 9,192,631,770 cycles of radiation corresponding to the transition between two hyperfine levels of the ground state of Caesium 133. TAI was 31s ahead of UTF (AddToMe: was that meant to be UTC?? -Ed.) on (AddToMe: midnight of?) Jul 01, 1997.

Compare GMT, UTC.