| Acronym | Meaning |
 | CISP | Canadian Indoor Source Profile |
| RHFS | Relativistic Hartree-Fock-Slater |
| PTCA | Percutaneous Transluminal Coronary Angioplasty |
| NOHSC | National Occupational Health And Safety Commission (Australia) |
| HCN | US Historical Climatology Network |
| XRFA | X-ray Fluorescence Analysis |
| PTSD | Post-traumatic Stress Disorder |
| ECIST | Estimated Chronic In Stream Toxicity |
| LDQ | Linnett Double Quartet (equivalent To Nonpairing Spatial Orbital Theory) |
| CMB | Core Mantle Boundary |
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