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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 …) |
Yoctosecond is equal to 10-24 second (unit of time), comes from a combination of the metric prefix yocto (y) with the second (s). Plural name is yoctoseconds with symbol is ys.
Attosecond is equal to 10 second (unit of time), comes from a combination of the metric prefix atto (a) with the second (s). Plural name is attoseconds with symbol is as.