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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 …) |
The 1 per day is equivalent to cycle per day, a unit of frequency measurement.
A femtohertz is a SI prefixes applied unit of frequency, symbol fHz, is a multiple of the of SI prefixes (femto) used with the hertz.