A nanometre (American spelling: nanometer, symbol nm) From Wikipedia, the free encyclopedia

A nanometre (American spelling: nanometer, symbol nm) (Greek: νάνος, nanos, dwarf; μετρώ, metrό, count) is a unit of length in the metric system, equal to one billionth of a metre (i.e., one millionth of a millimetre).

It is one of the more often used units for very small lengths, and equals ten Ångström, an internationally recognized non-SI unit of length. It is often associated with the field of nanotechnology. Formerly, millimicron (symbol mµ) was used for the nanometre.