| Acronym | Meaning |
| PAG | Periaqueductal Gray |
| LTBRM | Lanczos Tight Binding Recursion Method |
| AKH | Adipokinetic Hormone |
| MULTIMED | Multimedia Exposure Assessment Model |
| ATDHF | Adiabatic Time-dependent Hartree-Fock |
| PSD | Particle Size Distribution |
| OSCAR | Oxidn. And Scavenging Characteristics Of April Rains |
| PPO | Poly (phenylene Oxide) |
| HAF | Halogen Acid Furnaces (for Burning Halogenated Wastes |
| MIGD | Million Imperial Gallon Per Day |