n Nano (prefix) 10^-9 = 0,000 000 001

N Newton (acceleration of 1 m/s by second applied to 1 kg)

nA NanoAmpere

nc Non communiqué, non connu

NCV Net Calorific Value

nd Non défini, non déterminé

NF Noise Figure / Facteur de bruit

nF NanoFarad

ng/dl Nanogram per decilitre

ng/ml Nanogram per millilitre

nH NanoHenry

NIR Near InfraRed

nm Nanometer / Nanomètre

Nmi Nautical mile / Mille nautique (1 international nautical mile = 1852 m (fixed by convention) = 6076.1033 feet)

nmole nanomole (10^-9 mole)

Nov November / Novembre

ns Nanosecond / Nanoseconde

Ns Newton second (thrust)

Numeración romana

nW NanoWatt

NW Net Weight / Poids net

Oct October / Octobre

Oe Oersted

OIML Organisation Internationale de Métrologie Légale / International Organization of Legal Metrology / Organización Internacional de Metrología Legal

Old calendar, old style calendar Calendrier Julien / Calendario Juliano

oz Ounce / Once (1 ounce = 28.3495 grams = 0.0283495 kilograms)