| Acronym | Meaning |
| SC-1 | Standard Clean Solution #1 |
| PI | Polydispersity Index |
| NOONS | Natural Orbitals Occupation Numbers |
| RAFT | Reversible Addition-fragmentation Chain Transfer [polymerization] |
| PSD | Postsynaptic Density |
| ANA | Antinuclear Antibodies |
| ARCS | Alternative Remedial Contracting Strategy (US EPA) |
| ECCI | Electron Capture Chemical Ionization |
| LEIR | Low Energy Ion Ring |
| API | American Petroleum Institute |