| Acronym | Meaning |
| PBX | Plastic Bonded Explosive |
| WWTP | Wastewater Treatment Plant Or Process |
| FOREGS | Forum Of European Geological Surveys |
| SCF2 | Two-electron Self-consistent Field |
| ESD | Equiv. Spherical Diam. |
| PTMT | Poly (tetramethylene Terephthalate) |
| ASASP | Active Scattering Aerosol Spectrometer Probe |
| TDM | Truncated Diagonalization Method |
| VADW | Vibrationally-adiabatic Distorted-wave Method |
| UMNDO | Spin-unrestricted Modified Neglect Of Diatomic Overlap |