| Acronym | Meaning |
| WHOI | Woods Hole Oceanographic Institute |
| EORCU | European Ozone Research Coordinating Unit |
| RASSI | Restricted Active Space State Interaction |
| CID | Configuration Interaction With Doubly Excited Configurations |
| ISM | Intersecting Spheres Model (for Electronic-structure Calcns.) |
| TPO | Technical Project Officer |
| NICS | Nucleus-independent Chemical Shifts |
| MIS | Mobile Incineration System |
| PV-RR | Perturbational-variational-Rayleigh-Ritz (matrix Method In Mol. Calcns.) |
| CIOS | Classical Infinite Order Sudden (in Atom-mol. Reaction Calcns.) |