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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 …) |
Square megametre (International spelling as used by the International Bureau of Weights and Measures) or Square megameter (American spelling) , symbol Mm2, is the SI prefixes used with the metre of area or surface area.
A femtobarn (symbol: fb) is a unit of area equal to 10−43 m2.