| Acronym | Meaning |
| ROSAT | Roentgen Satellite |
| CATS | Corrective Action Tracking System |
| OTEC | Open Tubular Electrochromatography |
| PEEP | Positive End-expiratory Pressure |
| OGE | One Gluon Exchange |
| CAST | Cyclic Activated Sludge Technol. |
| FVEH | Fragment Valence Effective Hamiltonian (in Electronic-structure Calcns. On Mol. Fragments) |
| OLDA | Ordinary Linear Discriminant Analysis |
| APG | Antisymmetrized Product Of Geminals (wave Function) |
| NLDF | Nonlocal Density Functional |