Nanometre

Definition

1 nanometre (nm) is a billionth (10−9) of a meter (m); that is 100.000 times smaller than the thickness of a strand of hair.

More about the materials

Nano is a Greek word meaning dwarf or something in general extremely small. The atomic scale is measured in nanometers; 3-5 atoms lined up in a row would measure 1 nm.