| Acronym | Meaning |
 | PVB | Projected Valence Bond |
| UCCD | (spin) Unrestricted Coupled Cluster (with) Double (excitations) |
| EGO | Ellipsoidal Gaussian Orbital |
| IMO | International Maritime Organization |
| RTD | Resonant Tunneling Diode |
| HF MO LCAO | Hartree-Fock MO LCAO |
| SMR | Standardized Mortality Ratios |
| ICRF | Imperial Cancer Research Fund |
| BEST | Basic Extractive Sludge Treatment |
| CDIR | Carbon Dioxide Information Repository |
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