Definition:Millimetre/Square Millimetre
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Definition
The square millimetre is a metric unit of area.
The symbol for the square millimetre is $\mathrm {mm}^2$.
Linguistic Note
The spelling millimetre is the one adopted by the International Bureau of Weights and Measures. Millimeter is the variant used in standard American English.
See the linguistic note on metre.
Linguistic Note on Milli-
The prefix milli- derives from the Latin mille, which means one thousand.