| Acronym | Meaning |
| UF | Uncertainty Factor (in Oral RfD) |
| PCS | Permit Compliance System |
| TSC | Thermal Stimulated Current |
| MESP | Molecular Electrostatic Potential |
| QCA | Quasichemical Approxn. (in Calcns. On Semiconductors) |
| LOMO | Lowest Occupied Molecular Orbital |
| SGHWR | Steam-generating Heavy Water Reactor |
| ISGO | International Structural Genomics Organization |
| GMQDT | Generalized Multichannel Quantum Defect Theory |
| ARDS | Acute Respiratory Distress Syndrome |