| Acronym | Meaning |
| PAR | Photosynthetically Active Radiation |
| PD | Photoelectron Diffraction |
| PAC | Perturbed Angular Correlation |
| BPR | Biological Phosphorus Removal |
| IAVI | International AIDS Vaccine Initiative |
| ATF | Activating Transcription Factor |
| AST | Aboveground Storage Tank |
| XRFS | X-ray Fluorescence Spectroscopy |
| TIC | Total Inorganic Carbon |
| MCR | Minimum Creep Rate |