Wikipedia: Nanometer

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1 x 10^-9 metres.

A nanometer (or nanometre) is 10^-9 metres.
Its abbreviation is nm.
It is an SI measure of length, common in measuring the wavelength of electromagnetic radiation, amongst other things.

A nanometer (or nanometre) is 10^-9 metres. Its abbreviation is nm. It is an SI measure of length, common in measuring the wavelength of electromagnetic radiation, amongst other things.