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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 …) |
Zettagram or zettagramme is equal to 1021 gram (unit of mass), comes from a combination of the metric prefix zetta (Z) with the gram (g). Plural name is zettagrams.
The short hundredweight or cental of 100 lb (45.359237 kg) is used in the US and Canada.