| Acronym | Meaning |
| PSD | Prevention Of Significant Deterioration |
| PTGS | Picosecond Transient Grating Spectroscopy |
| CART | Cocaine And Amphetamine Regulated Transcript |
| PDA | Phase Doppler Analysis |
| AICE | American Institute Of Chemical Engineers |
| AGN | Active Galactic Nuclei |
| BOSS | Boron Out-diffused Surface Strap |
| FEI | Fire And Explosion Index |
| ATM | Aerosol Trajectory Model |
| APG | Antisymmetrized Product Of Geminals (wave Function) |