| Abbreviation | Definition |
|---|---|
| NMOG | Norwegian Meeting on Organic Geochemistry |
| NMP | N Methyl Pyrrolidone |
| NMP | N-methyl-2-pyrrolidone |
| NMPB | N-Ethyl-3-Piperidyl Benzilate |
| NMR | Non Monotonic Reasoning |
| NMU | NitrosoMethylUrea |
| NN | Nano- Crystal |
| NN | Nano-Crystal |
| NN | Nearest Neighbor |
| NNK | 4-(N-methyl-N-nitrosamino)-1-(3- pyridyl)-1-butanone |
| NNR | Natural Nitrate Reduction |
| NNS | Net Nitrogen Synthesis |
| NO | Nitric Oxide |
| No | Nobelium |
| NO2 | Nitrogen Oxide |
| NOE | Number Of Events |
| NORM | Naturally Occurring Radioactive Material |
| NOS | Nitrogen Oxide System |
| NOS | Nitrous Oxide System |
| NOS | Nitrous Oxide Systems |