| Acronym | Meaning |
| ITDHO | Improved Time-dependent Harmonic Oscillator |
| NSCEP | National Service Center For Environmental Publications |
| PTS | Pressurized Thermal Shock |
| BIF | Boilers And Industrial Furnaces (USEPA Rule) |
| MOCED | Molecular Orbital Constrained Electron Diffraction Method |
| EFS | Event-free Survival |
| CEC | Cation Exchange Capacity |
| PAIS | Public Affairs Information Service |
| LMSAL | Lockheed Martin Solar And Astrophysics Laboratory |
| RIR | Relative Inhalation Risk |