| Acronym | Meaning |
| RLS | Recursive Least Squares (algorithm) |
| HENA | High-energy Neutral Atom |
| ATF | Automatic Transmission Fluid |
| QPMDA | Quasiparticle Mean Density Approxn. (assocd. With Local-d. Theory) |
| AQS | Air Quality Standard |
| BAAQMD | Bay Area Air Quality Management District |
| CHAMP | Community Health Air Monitoring Program |
| WOCE | World Ocean Circulation Experiment |
| EPCRA | Emergency Planning And Community Response Act |
| DNS | Direct Numerical Simulation |