| Acronym | Meaning |
| P-T-T-D | Pressure-temperature-time-deformation Path (for Metamorphic Rocks) |
| SAI | Simplified Ab Initio Method |
| VLA | Very Large Array |
| HMIMS | Hazardous Materials Incident Management System |
| PPKTP | Periodically Poled KTiOPO4 |
| DCA | Detrended Correspondence Ordination Analysis |
| ACC | American College Of Cardiology |
| UKIRT | United Kingdom Infrared Telescope |
| EBT | Electron Beam Tomography |
| PAA | Photon Activation Analysis |