| Acronym | Meaning |
| GEMS | General Energy And Material Balance System [model] |
| IUTOX | International Union Of Toxicology |
| NCEH | National Center For Environmental Health |
| R-GVB | Resonating-generalized Valence Bond (wave Function) |
| NRIOSA | Nonreactive Infinite-order Sudden Approxn. |
| BAO | Best Atomic Orbital Basis |
| OIC | Optical Interface Coupler |
| NDLM | Nondiagonal Lagrange Multiplier |
| LID | Low Impact Developmentpar |
| DOUBTFUL | Double Quantum Transitions For Finding Unresolved Lines |