Nitrogen gas (chemical symbol)
Nanoampere Not applicable National Association of Skin Diving Schools (USA) National Association of Underwater Instructions (USA) National Bureau of Standards (USA)
No decompression limit Non-destructive testing Neon (gas, chemical symbol) Natural gas liquid(s) Nominal horsepower Nitrogen-oxygen mixture "No-joint-juice" Nanometer Nautical mile No middle initial Newton(s) per square meter Naval Medical Research Institute
National Oceanographic and Atmospheric Agency (USA) Nominal ocular hazard distance (lasers)
American straight pipe Net positive suction head American Taper Pipe National pipe thread National pipe thread fine (USA) Net registered tonnage Nanosecond Net tonnage
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