| Acronym | Meaning |
| ARM | Area Radiation Monitoring |
| CISDT | CI With Single And Double And Triple Excitations |
| GEA | Gradient-expansion Approxn. (in Exchange-energy Calcns.) |
| IGBT | Insulated Gate Bipolar Transistor |
| ICE | Interleukin 1beta-converting Enzyme |
| PNO-CI | Pseudonatural Orbital-configuration Interaction |
| WFPC2 | Wide Field Planetary Camera 2 |
| IPWO | Interface Plane Wave Orbitals |
| CMP | Compact Model Potential |
| IRIS | Integrated Risk Information System |