| Acronym | Meaning |
| RSCA | Relativistic Semiclassical Approximation (for At. Scattering) |
| PIAC | Polymer Industrial Advisory Council |
| MSO | Maximum Similarity (spin) Orbital |
| CIRRIS | Cryogenic InfraRed Radiance Instrument For Shuttle |
| PAG | Periaqueductal Gray |
| IBIL | Ion Beam Induced Luminescence |
| MVP | Major Vault Protein |
| SCOT | Shell Claus Off-gas Treating |
| AOIPS | Atmospheric And Oceanographic Information Processing System |
| CFC | Corrosion-fatigue Cracking |