| Acronym | Meaning |
| J(Z)CCS | J(z)-conserving Coupled States Method (for Rotationally Inelastic Atom-molecule Collisions |
| VISITT | Vendor Information System For Innovative Treatment Technology (US EPA) |
| LNO | Localized Natural Spin Orbital |
| TDI | Tolerable Daily Intake |
| EAA | Essential Amino Acids |
| LTBRM | Lanczos Tight Binding Recursion Method |
| SME | Solid-metal Embrittlement |
| TLP | Transient Liquid Phase |
| ISLOCA | Inter-system Loss-of-coolant Accident |
| WFPC2 | Wide Field Planetary Camera 2 |