| Acronym | Meaning |
| PPIC | Pollution Prevention Information Clearinghouse |
| FCA | Fuzzy Cluster Analysis |
| PBMS | Particle Beam Mass Spectrometry |
| FEA | Finite-element Analysis |
| STEAM | Stimulated Echo Acquisition Mode |
| SQCC | Semiclassical Quantization (by) Circuit Counting |
| DBI | Diazepam Binding Inhibitor |
| CCTM | Coupled-channel Transition Matrix (in Atom-surface Scattering) |
| CTDM | Complex Terrain Dispersion Model (air Quality) |
| CBS | Complete Basis Set |