| Acronym | Meaning |
| PDR | Proliferative Diabetic Retinopathy |
| HLPSA | Hazardous Liquid Pipeline Safety Act |
| ECP | Effective Core Potential Approxn.(in Electronic-structure Calcn.) |
| RIFM | Research Institute For Fragrance Materials |
| MCDF-OL | Multiconfiguration Dirac-Fock Optimum Level |
| FFAR | Fuel And Fuel Additive Registration |
| NPC | Nuclear Pore Complex |
| (SC)2CI | Self-consistent Size-consistent CI |
| ACP | Approximate Coupled-pair (method For Correlation-energy Calcn.) |
| MC | Metal Carbide |