| Acronym | Meaning |
| APP | Acoustic Phase Plate |
| HVAC | Heating, Ventilating, Air-conditioning |
| ANPR | Advance Notice Of Proposed Rulemaking |
| SIXA | Silicon X-ray Array |
| RDA | Representational Difference Analysis |
| STARR | Staged Approach To Risk Reduction |
| LCFFUA | Linear Combination Of Floating Functions Of United Atom |
| GCS | Geo-Common Subsystem (subsystem Of AIRS) |
| LEP | Large Electron-Positron Collider |
| WFI | Water For Injection (pharmaceutical Term) |