| Abbreviation | Definition |
|---|---|
| NOx | Nitrogen Oxide |
| NOx | Nitrous Oxides |
| Np | Neptunium |
| NP | Nucleus Plugin |
| NPA | Normal Propyl Alcohol |
| NPAA | Non Physiological Amino Acid |
| NPB | N Propyl Bromide |
| NPG | Neat Propylene Glycol |
| NPH | Non Phototropic Hypocotyl |
| NPK | nitrogen phosphorus, potassium [fertilizer ratio] |
| NPL | Neutral Protamine Lyspro |
| NPLIN | non-photochemical laser-induced nucleation |
| NPQ | Non Photochemical Quenching |
| NPR | Neutralization Potential Ratio |
| NPS | Network Protein Sequence |
| NPV | Negative Preliminary Valence |
| NQO | Nitroquinoline Oxide |
| NQO1 | NADPH: Quinone Oxidoreductase 1 |
| NR | Nitrile Rubber |
| NR | No Reaction |