| Acronym | Meaning |
| SEMPA | Scanning Electron Microscopy With Polarization Analysis |
| ECCI | Electron Capture Chemical Ionization |
| RSA | Rat Serum Albumin |
| PIAMS | Photoionization Aerosol Mass Spectrometry |
| UGF | Unitary-group Formulation (in Many-body Quantum Theory) |
| ACWM | Asbestos Containing Waste Material |
| USMAR | Upflow Static-Media Anaerobic Reactor |
| RSAC | Remote Sensing Applications Center (US Forest Service) |
| GTT | Glucose Tolerance Test |
| GRB | Gamma Ray Burst |