| Acronym | Meaning |
| PICA | Picosecond Imaging Circuit Analysis |
| LASCS | Light-activated Silicon Controlled Switch |
| PTS | Phosphotransferase System |
| TDI | Tolerable Daily Intake |
| EPOCA | Environmental Project On Central America |
| PUF | Polyurethane Foam |
| PPGA | Plastic Pin Grid Array [electronic Package] |
| NAPAP | National Acid Precipitation Assessment Program |
| IBR | Infectious Bovine Rhinotracheitis |
| USPHS | United States Public Health Service |