| Acronym | Meaning |
| OCAP | Open-channel Air Preheater |
| ECNI | Electron Capture Negative Ionization |
| AAMOM | An Approximate Molecular Orbital Method |
| WMO | World Meteorological Organization |
| UTI | Urinary Tract Infection |
| RCT | Reference Control Technology |
| PD | Photoelectron Diffraction |
| CE/ESIMS | Capillary Electrophoresis/electrospray Ionization Mass Spectrometry |
| SCF | Single Crystal Fiber |
| OPPIS | Optically Pumped Polarized Ion Source |