Millimeter (mm)
Definition: A millimeter (symbol: mm) is one thousandth of a meter (0.001 m). It is a metric unit for small everyday and technical measurements.
History/origin: The millimeter was introduced with the metric system as a convenient decimal subdivision of the meter. Its simplicity made it practical for crafts, engineering, and manufacturing.
Current use: Millimeters are used worldwide in engineering drawings, product dimensions, rainfall measurements, medical imaging references, and many everyday measurements requiring more precision than centimeters.


