| Acronym | Meaning |
 | MRL | Maximum Residue Limit |
| HALT | Hydrate Addition At Low Temperature (for Sulfur Dioxide Removal From Flue Gases) |
| AEROS | Aerometric And Emissions Reporting System |
| CLS | Classical Least-squares |
| TLS | Two-level System (with Tunneling Transitions Between Wells Of Double-well Potential) |
| ORU | In Orbit Replaceable Unit (spacecraft) |
| HID | High Interstitial Defect |
| DSID | Direct Sample Insertion Device |
| GNACHO | Gravitationally Neg. Anomalous Compact Halo Object |
| MSCE | Modified Semiclassical Exchange (aproxn. In Scattering Calcns.) |
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