| Acronym | Meaning |
| ICZN | International Commission On Zoological Nomenclature |
| ESD | Equiv. Spherical Diam. |
| LDC | Less Developed Countries |
| PRENFLO | PRessurized ENtrained FLOw (process) [combustion And Gasification] |
| RED | Radiation Enhanced Diffusion |
| BLRG | Broad-line Radio Galaxy |
| IVNAA | In Vivo Neutron Activation Analysis |
| CIMAH | Control Of Industrial Major Accident Hazards |
| RIS | Rotational Isomeric State |
| EAES | Electron-excited Auger Electron Spectroscopy |