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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 …) |
Picosecond is equal to 10-12second (unit of time), comes from a combination of the metric prefix pico (p) with the second (s). Plural name is picoseconds with symbol is ps.
A moment (momentum) was a medieval unit of time. The movement of a shadow on a sundial covered 40 moments in a solar hour.