| Acronym | Meaning |
| HFA | Humic And Fulvic Acids |
| TBN | Total Base Number |
| LVDT | Linear Variable Differential Transformer |
| IOSA | Infinite Order Suden Approxn. (for Mol. Scattering Calcns.) |
| SSME | Space Shuttle Main Engine |
| ANOI | Advance Notice Of Intent |
| FAAO | Free-atom Atomic Orbital |
| CEQB | Collinear Exact Quantum (with Adiabatic) Bending (energy) (method For Reactive Scattering) |
| SDIM | Scaled Diatomics-in-molecules |
| PISCES | Power Plant Integrated Systems: Chem. Emission Studies |