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Symbol | Definition |
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≡ | exactly equal |
≈ | approximately equal to |
= | equal to |
digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |
Yottasecond is equal to 1024 second (unit of time), comes from a combination of the metric prefix yotta (Y) with the second (s). Plural name is yottaseconds with symbol is Ys.
A month is a unit of time, used with calendars, which is approximately as long as a natural period related to the motion of the Moon; month and Moon are cognates.