| Acronym | Meaning |
| ICAO | International Civil Aviation Organization |
| UDWA | Unitarized Distorted-wave Approximation |
| MQL | Minimum Quantifiable Limit |
| SPRKKR | Spin-polarized Relativistic Korringa-Kohn-Rostoker |
| HAN | Heavy Aromatic Naphtha |
| DWPE | Distorted-wave (with) Polarization (and) Exchange |
| AMSU | Advanced Microwave Sounding Unit |
| VCM | Variational Cellular Method (for Electronic Structure Calcns.) |
| DAF | Diallyl Fumarate |
| F4 | Fourth-order Feenberg (quantum Theory) |