| Acronym | Meaning |
| APTI | Air Pollution Training Institute |
| HUD | Housing And Urban Development |
| UHFS | Unrestricted Hartree-Fock-slater |
| TRS | Transverse Rupture Strength |
| DIVAH | Diagonally Corrected Vibrationally Adiabatic Hyperspherical (theory In Scattering Calcns.) |
| AIPA | American Inventors Protection Act |
| EFTC | European Fluorocarbon Technical Committee |
| PEN | Polyethylene Naphthalate |
| HPM | Hypervirial-perturbative Method |
| TSFZ | Traveling Solvent Floating Zone |