| Acronym | Meaning |
| FFV | Flexible Fuel Vehicle |
| ROS | Restricted (or Roothaan) Open-shell (Hamiltonian) |
| GDR | German Democratic Republic |
| FOEA | First-order Eikonal Approximation |
| ATTIC | Alternative Treatment Technology Information Center (US EPA) |
| FNMRI | Flow Nuclear Magnetic Resonance Imaging |
| LCEC | Liquid Chromatography With Electrochemical Detection |
| LKKR | Layer Korringa-Kohn-Rostoker (in Interface Electronic Structures) |
| PVN | Paraventricular Nucleus |
| IRC | Intrinsic Reaction Coordinate |