| Abbreviation | Definition |
|---|---|
| NL | Normal Litre |
| NLH | Newton-Litre Hour |
| NLT | Not Less Than |
| NM | NanoMeter |
| NM | Newton Meter |
| NM | Normalized Minutes |
| NM | Not Much |
| NMI | National Meter Identifier |
| NMI | Nautical Mile |
| NMU | Natural Meaning Unit |
| nn. | numbers |
| NOH | Net Operating Hours |
| NOMH | NOMinal height |
| NOS | Non Otherwise Specified |
| NPH | Nuts Per Hour |
| NPSHA | Net Positive Suction Head Available |
| NRT | Net Registered Ton |
| NS | nanosecond |
| NS | Nano-Second |
| NS | NanoSeconds |