| Acronym | Meaning |
| EIX | Electrochemical Ion Exchange |
| ROSAT | Roentgen Satellite |
| BHT | Bottom-hole Temperature |
| U.S.C. | United States Code |
| TDM | Therapeutic Drug Monitoring |
| PGE | Platinum Group Elements |
| QDO | Quantum-defect Orbital (theory) |
| MDLC | Multidimensional Liquid Chromatography |
| CTOD | Crack Tip Opening Displacement |
| BO | Biorthonormal (wave Function) |