| Acronym | Meaning |
| PBC | Periodic Bond Chain |
| MSR | Mammalian Selectivity Ratio |
| TMB | Table Mesa Basalt (USGS Rock Standard) |
| SESMO | Semiempirical Scaled Molecular Orbital |
| GAPT | Generalized Atomic Polar Tensor |
| CCSDT | Coupled Cluster With Single |
| MVEG | Motor Vehicle Emissions Group |
| AAR | Accumulation-area Ratio (for Glaciers) |
| RCRA | Resource Conservation And Recovery Act Of 1976 |
| SRF | State Revolving Fund (module Of GICS) |