| Acronym | Meaning |
| ACI | Acceptable Chronic Intake |
| IAE | Immunoaffinity Extraction |
| SPA | Separated Pair Approxn. (wave Function) |
| PB | Particle Beam |
| ASI | Advanced Study Institute (NATO) |
| NODS | NASA Ocean Data System |
| PTR-MS | Proton Transfer Reaction-mass Spectrometry |
| EMA | Effective Mass Approxn. (for Impurity Energy Levels) |
| RSMST | Real-space Multiple-scattering Theory (in Electronic Structure) |
| CPE | Cloud Point Extraction |