| Acronym | Meaning |
| GSA | Generator-state Approach (in Many-body Quantum Theory) |
| FEP | Free Energy Perturbation |
| MMS | Molecular Modulation Spectroscopy |
| PKD | Protein Kinase D |
| UFC | Uniform Fire Code |
| OSAC | Organic Structures Accessed By Computer |
| OPG | Optical Parametric Generator |
| BID | Background Information Document |
| IMAGE | International Monitor For Auroral Geomagnetic Effects |
| PPHM | Parts Per Hundred Million |