| Acronym | Meaning |
| GEF | Guanine Nucleotide Exchange Factor |
| LEMO | Lowest Empty Molecular Orbital (equivalent To LUMO) |
| IEC | Inertial Electrostatic Confinement |
| MQL | Minimum Quantifiable Limit |
| FIT | Field Investigation Team (US EPA) |
| SLEEM | Scanning Laser-enhanced Electrochemical Microscopy |
| AIST | Agency Of Industrial Science And Technology (Japan) |
| SOFAR | Sound Fixing And Ranging |
| OPTS | Office Of Pesticides And Toxic Substances (USEPA) |
| SSB | Semiclassical Sudden Born (approxn. In Ion-atom Collisions) |