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One billionth of a meter (or 0.000000001 meter), nm is used as a scale to measure electromagnetic wavelengths of light – color and light spectrums are expressed in nanometers.
angstrom, ångström, ångströms, micrometre, micron, microns, picometre, millimicrometre, millimicron, millimicrons, nanometer, nanometres, nanometers