The standard unit of length is the meter, and any multiple and submultiple such as kilometer and millimeter.
Nonstandard units include foot, inch, mile, light-year, parsec, astronomical unit.
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You can invent any number of nonstandard units, but none of them is "best". It is best to use standard units, that is, the meter.
Kilogram is a unit of mass, not of length.Kilogram is a unit of mass, not of length.Kilogram is a unit of mass, not of length.Kilogram is a unit of mass, not of length.
The unit based on the length of a forearm was the cubit
An inch is a unit of length, a square meter is a unit of area. You can't convert that.An inch is a unit of length, a square meter is a unit of area. You can't convert that.An inch is a unit of length, a square meter is a unit of area. You can't convert that.An inch is a unit of length, a square meter is a unit of area. You can't convert that.