| Acronym | Meaning |
| IGCI | Industrial Gas Cleaning Institute |
| CCPPA | Coupled-cluster Polarization-propagator Approxn. |
| PANAK | Peroxyacetyl Nitrate Aldehyde Ketones |
| NASA | National Aeronautics And Space Administration |
| RBM | Radial Breathing Mode |
| HARA | Hazard Assessment By Risk Analysis |
| RBR | Reductive Burning Recovery |
| SLS | Sequential Lateral Solidification |
| LTH | Luteotropic Hormone |
| LCRA | Linear Combination Of Rydberg Orbitals |