| ANAN | Air Natural // Air Natural Cooling [engl.] Bauform von Trockentransformatoren |
| FBA | First Born Approximation |
| EBA | Extended Born Approximation |
| cba | Coulomb-Born Approximation physikalische Methode |
| SCBA | Self-Consistent Born Approximation |
| bgy | Born-Green-Yvon [equation] |
| bo | Born-Oppenheimer [approximation] [Theorie] |
| DWBA | Distorted Wave Born Approximation |
| EV 11-005 C | Heinrich Born GmbH Import - Export Naturdarm, Sortierbetrieb Saarbrücken-Gersweiler, Saarland |
| Nat. Hist. | Natural History Zeitschrift |
| LNG | Liquified Natural Gas |
| NO | Natural Orbital |
| NKT | Natural Killer T cell |
| NLP | Natural Language Processing |
| PNO | Pair Natural Orbitals |
| NPU | Natural Processing Unit |
| NLP | Natural Language Processing |
| NLT | Natural Language Technology |
| NCS | Natural Colour System NCS-Farbsystem |
| INO | Iterative Natural Orbital |
| CNG | Compressed Natural Gas [mostly methane] |
| ANO | Average Natural Orbital[s] |
| ANO | Atomic Natural Orbital |
| NAO | Natural Active Orbital |
| PNAS | Proceedings of the Natural Academy of Sciences |
| ENGVA | European Natural Gas Vehicles Association Hoofddorp, http://www.engva.org |
| NPA | Natural Population Analysis [Methode] |
| CANAL | Catalog with Natural Language Access |
| NRDC | Natural Resource Defense Council |
| DNR | Department of Natural Resources [U.S. Government] |
| Nat. Hazards | Natural Hazards [hat ein eigenes Review] Zeitschrift |
| NBO | Natural Bond Order [Methode] |
| NI-EV 11-401 C | Hong Cheng Natural Casings GmbH Jork, Niedersachsen |
| Nat. Areas J. | Natural Areas Journal [hat ein eigenes Review] Zeitschrift |
| E.F.N.M.U. | European Federation of Natural Medicine Users |
| Nat. Resour. Model. | Natural Resource Modeling [hat ein eigenes Review] Zeitschrift |
| APNO | Atomic Pair Natural Orbital [engl.] |
| Soc. Nat. Resour. | Society and Natural Resources [hat ein eigenes Review] Zeitschrift |
| Bull. Br. Mus. Nat. Hist., Bot. | Bulletin of the British Museum of Natural History, Botany Zeitschrift |
| Nat. Hazards Earth Syst. Sci. | Natural Hazards and Earth System Sciences [hat ein eigenes Review] Zeitschrift |
| Bull. Peabody Mus. Nat. Hist., Yale Univ. | Bulletin Peabody Museum of Natural History, Yale University Zeitschrift |