| Acronym | Meaning |
| TPE | Threshold Photoelectron |
| AFA | Abstract Factor Anal. (statistics) |
| QCFF/PI | Quantum Mechanical Consistent Force Field Method For Pi-electron Systems |
| PVN | Paraventricular Nucleus |
| ISM | Interstellar Medium |
| IAWPRC | International Association For Water Pollution Research And Control |
| ICAO | International Civil Aviation Organization |
| SSF | Slow Sand Filtration (water Treatment) |
| SODAR | Sound Detection And Ranging (meteorological Instrument) |
| ADXPS | Angular Dependent X-ray Photoelectron Spectroscopy |