| Acronym | Meaning |
| RDI | Reference Daily Intake |
| LIRE | Laser Ionization Recombination Emission |
| ECP-CPP | Effective Core Potential (augmented By)-core Polarization Potential |
| RIGS | Radioimmunoguided Surgery |
| CERCLA | Comprehensive Environmental Response |
| G1 | Gaussian-one (theory For Calcg. Mol. Energies) |
| RSE | Relativistic Symmetric Eikonal |
| RSRG | Real-space Renormalization Group (method In Calcn. Of Green Functions For Electrons In Crystals) |
| LCCO | Light Catalytic Cycle Oil |
| NEDS | National Emission Data System (USEPA) |