Unit Symbol
The International Hydrographic Organization, whose membership includes essentially all seafaring nations, and the International Bureau of Weights and Measures use M as the abbreviation for the nautical mile. The preferred abbreviation of the International Civil Aviation Organization is NM. The abbreviation nm, though conflicting with the SI symbol for the nanometre, is also widely used. The SI symbol for the newton metre is N m (with a space) or N·m, not nm, because only prefixes may abut a unit symbol.
Read more about this topic: Nautical Mile
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