Nm

Nm
   1. or N·m
   symbol for newton meter, a unit of torque (see above).
   2.
   abbrevation for normal metric, a symbol for the density of worsted yarns. Yarn is described as a/b Nm if it is a-ply (has a individual strands) and there are b kilometers of yarn per kilogram. An example might be 2/40 Nw, describing a 2-ply yarn having 40 kilometers per kilogram. If the yarn is single-ply, the a is often omitted, so a single-ply yarn is described as b Nm.

Dictionary of units of measurement. 2015.

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