| Acronym | Meaning |
| GRRR | Graduated Response For Risk Reduction |
| OSSA | Office Of Space Science And Applications (NASA) |
| ICPD | Inductively Coupled Plasma Deposition |
| PETRA | Plasma Engineering And Technology Research Assembly |
| CIDR | Controlled-internal Drug Release |
| CSF | Carcinogenic Slope Factor |
| MCCP | Mountain Cloud Chemistry Program |
| VEH | Valence Effective Hamiltonian Method (for Electronic Structure) |
| PSB | Product Safety Branch |
| PT2D | Second-order Perturbation Theory (with) Diagonal (part Of Fock Matrix) |