| Acronym | Meaning |
| HPI | Hydrocarbon Processing Industry |
| ASHI | American Society Of Histocompatibility And Immunogenetics |
| VPM | Variable Phase Method (for Electron-atom Scattering Calcns.) |
| PPM | Pair Population Method |
| ADA | American Diabetes Association |
| COBE | Cosmic Background Explorer Satellite (NASA) |
| NADP | National Atmospheric Deposition Program |
| ANSI | American National Standards Institute |
| EMAT | Electromagnetic-acoustic Transducers |
| LTP | Leachate Treatment Plant |