| Acronym | Meaning |
| MSM | Multiple-scattering Model |
| PMAMS | Patterned Multi-array |
| FRC | Federal Records Center |
| IAG | International Association Of Geodesy |
| RTMS | Repetitive Transcranial Magnetic Stimulation |
| CASPT | Complete Active Space-perturbation Theory |
| TAMS | Toxic Air Monitoring System (US EPA) |
| RRHO | Rigid Rotor-harmonic Oscillator (approxn.) |
| PAW | Projector Augmented-wave [ab-initio Method] |
| ELO | Edge Localized Orbital |