| Acronym | Meaning |
| ESA | Electrostatic Sector Analysis |
| LSM | Land Surface Model |
| TIAS | Technology Investment Assessment Screen |
| RRHO | Rigid Rotor-harmonic Oscillator (approxn.) |
| RKB | Restricted Kinetic Balance (method In Calcns. Of Wave Functions And Energies) |
| SOF | Soluble Organic Fraction |
| RHO | Reduced Hamiltonian Orbital Method |
| EHF | Extended Hartree-Fock |
| DEM | Digital Elevation Model |
| SAM | Scanning Auger Microscopy |