The abbreviation is mm.
Answered by: Emilio Aranda_EL Paso, Tx (Emilioa)
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The word millimeter can be abbreviated as mm.
Such that centimetre can be abbreviated to cm, millimetre can be abbreviated to mm.
Milliamps = mA.
No, although a centimetre is a unit of length, the meter (m) is the SI base unit for length. 1 cm = 0.01m. Not only isn't it a base unit, it's not even an SI unit! In the SI system, multiples are based on 10 raised to the power of multiples of 3. So, whereas a millimetre, is an SI unit, a centimetre is not -although, of course, it is a metric unit.
The metric unit for 1 millimeter is meters. 1 millimeter is equal to 0.001 meters.