Nanometers are used to measure very tiny things, like the wavelength of light or the size of atoms.
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The abbreviation for nanometer is "nm". No Greek letters are used in this case.
1 nanometer=1.0510-9
Nanometer is definitely smaller then a meter.
A nanometer is (1/1,000,000,000) of a meter, you decide
A micron is 1,000 times larger than a nanometer.