what does nm measurement mean
Units of measure. 1  Nanometer (nm), an SI unit of length, equal to 10â9 m (a billionth of a meter) 2  Nanomolar (nM), in chemistry, one thousand-millionth of a molar. 3  Nautical mile (NM or nmi), a unit of length used for maritime and aviation purposes. 4  Newton metre (Nm, may also be written as NÂ·m), a unit of torque.