NanometerNanometer (nm), an SI unit of length, equal to 10−9 m (a thousand-millionth of a meter) Nanomolar (nM), in chemistry, one thousand-millionth molar. Video shows what NM means. NM/M meaning is Newton-Metez Per Meter and other full form of NM/M definition take part in below table. Okay N M in newton meter in torque. This page is all about the meaning, abbreviation and acronym of NMM explaining the definition or meaning and giving useful information of similar terms.