|
|
|
|
|
|
Symbol | Definition |
---|---|
≡ | 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 …) |
A attobarn (symbol: ab) is a unit of area equal to 10−46 m2.
The hide was an English unit of land measurement originally intended to represent the amount of land sufficient to support a household.