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( => ( => ( => ISO 31-2 [pageid] => 3371541 ) =>

ISO 31-2 is the part of "international standard "ISO 31 that defines names and symbols for "quantities and "units related to periodic and related phenomena.

Its definitions include:

Quantity Unit Remarks
Name Symbol Name Symbol Definition
period, periodic time T "second s
time constant of an exponentially varying quantity τ second s
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