| NRMPS | NRMRC | NRMRL | NRMRWIB | NRMS |
| NRMSC | NRMSD | NRMSE | NRMSEQ | NRMSIR |
| NRMT | NRMTA | NRMU | NRMWG | NRN |
| NRNA | NRNASC | NRNB | NRNC | NRND |
| NRNF | NRNIC | NRNP | NRNR | NRNS |
| NRNSC | NRNW | NRNY | NRO | NROAV |
| NROC | NROCC | NROCRC | NROD | NRODT |
| NROF | NROFF | NROG | NROI | NROK |
| NROM | NRO (National Reconnaissance Office) Operations Squadron | NROOGD | NROP | NRORP |
| NROS | NROSH | NROSO | NROS Predictive Index | NROSS |
| N-ROSS | NROT | NROTC | NROTCU | NROU |
| NROW | NROWS | NRP | Nitrogen Mustard-N-Oxide | Nitrogen & Other Inerts |
| Nitrogenous Biochemical Oxygen Demand | Nitrogenous Oxygen Demand | Nitrogen Oxide | nitrogen oxide | Nitrogen, Oxygen, Carbon and Ash |
| Nitrogen, Oxygen, Carbon, Ash, Sulfur, Hydrogen | Nitrogen Permease Regulator 2 | Nitrogen Phosphorous Detector | Nitrogen, Phosphorous, Potassium | Nitrogen-Phosphorus Flame Ionization Detector |
| Nitrogen Physiology of Forest Plants and Soils | Nitrogen Pressure Valve | Nitrogen Purge Control | Nitrogen Purge Unit | Nitrogen Rejection Unit |
| Nitrogen Response Factor 1 | Nitrogen Risk Assessment Model for Scotland | Nitrogen Saturation Experiments | Nitrogen Tank Assembly | Nitrogen tetroxide |
| Nitrogen Tillage-Residue Management | Nitrogen to Phosphorous Ratio | Nitrogen trifluoride | Nitrogen Use Efficiency | Nitrogen Wash-Out Delay |
| Nitrogen Wash Unit | Nitroglycerin | nitroglycerin | Nitroglycerine | nitroglycerine |
| Nitroguanidine | Nitro High School | Nitroimidazole-Theophylline | Nitro Interconnect Protocol | NitroMed, Inc. |
| Nitronium Perchlorate | Nitro Oxide System | Nitro Performance | Nitrophenol-P-Guanidino Benzoate | Nitrophenyl Vinyl Ether |
| Nitrotriazolone | Nitrotyrosine | nitrous acid | Nitrous Express, Inc. | Nitrous Metal-Oxide Semiconductor |
| Nitrous Oxide | nitrous oxide | Nitrous Oxide and Halocarbon Intercalibration Experiment | Nitrous oxide system | Nitroveratryloxycarbonyl |
| Nitrox and Technical Diving Expeditions | Nitroxide-Mediated Polymerisation | Nitroxide-Mediated Radical Polymerization | NITS | NITSA |
| NITSP | NITSS | NITSY | NITT | NITTA |
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