| Abbreviation | Definition |
|---|---|
| NQA | Nuclear Quality Assurance |
| NQG | Naive Quantum Gravity |
| NQR | Nuclear Quadrupole Resonance |
| NR | Nuclear Reactor |
| NRG | Neutron Radiated Glodents |
| NRRT | Normal Reference Range Table |
| NRS | Nuclear Reaction Spectrometry |
| NRU | National Research Universal nuclear reactor, Chalk River, Ontario |
| NS | Non-State |
| NSBP | National Society of Black Physicists |
| NSEP | National Standard Examination in Physics |
| NSF | Nuclear Science Foundation |
| NSFD | Net Shape Forming Development |
| NSRP | Neutron Science Research Program |
| NSTP | Non-Spatial Thinking Process Theory |
| NTC | Negative Temperature Coefficeint |
| NTIMS | Negative Thermal Ionization Mass Spectrometer |
| NUS | Nuclear Safety Standard |
| NV | Night Vision |
| NV | nitrogen vacancy |