| Acronym | Meaning |
| PW-TDSE | Plane Wave-time Dependent Schroedinger Equation |
| QTPT | Quantum Thermodynamic Perturbation Theory |
| CITAC | Cooperation On International Traceability And Analytical Chemistry |
| MORT | Molecular Orbital Resonance Theory |
| SEDM | Selective Excitation Double Moessbauer |
| ICOH | International Commission On Occupational Health |
| VEH | Valence Effective Hamiltonian Method (for Electronic Structure) |
| FIMS | Fine-split IR Multispectral Scanner (for Remote Sensing) |
| VPDB | Vienna Peedee Belemnite |
| IPMA | Ion Probe Microanalysis |