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A millimetre (American spelling: millimeter, symbol mm) is a unit of length in the metric system, equal to one thousand of a metre, which is the current SI base unit of length. It can be written in scientific notations as 1×10<sup>−3</sup> m (engineering notation) or (exponential notation) — both meaning .
nanometre <<< micrometre <<< millimetre < centimetre < decimetre < metre < decametre < hectometre < kilometre
The corresponding unit of area is the square millimetre and the corresponding unit of volume is the cubic millimetre.
For the purposes of compatibility with Chinese, Japanese and Korean (CJK) characters, Unicode has symbols for:
They are useful only with East Asian fixed-width CJK fonts, because they are equal in size to one Chinese character.