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Unit seestem metric
Unit o lenth
Seembol nm 
Unit conversions
1 nm in ...... is equal tae ...
   SI units    1×10−9 m
   Naitural units    6.1877×1025 P
18.897 a0
   imperial/US units    3.2808×10−9 ft
 3.9370×10−8 in

The nanometre (SI seembol: nm) is a unit o lenth in the metric seestem, equal tae ane billiont o a metre. The name combines the SI prefix nano- (frae the Ancient Greek νάνος, nanos, "dwarf") wi the parent unit name metre (frae Greek μέτρον, metrοn, "unit o measurement"). It can be written in scienteefic notation as 1×10−9 m, in ingineerin notation as 1 E−9 m, an is simply 1 m / 1,000,000,000. Ane nanometre equals ten Angstroms.