| Acronym | Meaning |
| SPECT | Single Photon Emission Computerized Tomography |
| UPOT | Union Pacific Oxidation Test |
| AQCCT | Air Quality Criteria And Control Techniques |
| CDA | Cylindrical Deflector Analyzer |
| ORI | Octane Requirement Increase |
| RSS | Residual Sum Of Squares |
| CRQL | Contract Required Quantitation Limit |
| SSB | Semiclassical Sudden Born (approxn. In Ion-atom Collisions) |
| ASFF | Aerated Stationary Or Submerged Fixed-film (wastewater Treatment) |
| BARITT | Barrier Injection Transient Time |