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A millimetre (American spelling: millimeter), symbol mm is an SI unit of length that is equal to one thousandth of a metre.
1 mm is equal to:
See 1 E-3 m for comparisons.
The level of rainfall is also reported as millimeters as measured with a rain gauge.
micrometre << millimetre << centimetre
Unicode has symbols for "mm" (㎜), for square millimetre (㎟) and for cubic millimetre (㎣).
See also
Orders of magnitude (length)
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