Nanometre
A nanometre (American spelling: nanometer) is 10-9 metres. Its symbol is nm. It is an SI measure of length, commonly used in measuring the wavelengths of ultraviolet radiation and gamma rays; amongst other things. For a list of objects several nanometres large, see 1 E-9 m.
1 nm = 1000 picometre.
1000 nm = 1 micrometre aka 1 micron.
picometre << nanometre << micrometre