| Acronym | Meaning |
| PFRP | Process To Further Reduce Pathogens |
| PLD | Programmable Logic Device |
| SSTI | Small System Technol. Initiative (USEPA) |
| SGGA | Symmetric Group Graphical Approach (in CI Calcns.) |
| WORM | Write Once Read Many |
| RFLP | Restriction Fragment Length Polymorphism |
| CCI | Charge Contrast Imaging |
| REPA | Resource And Environmental Profile Analysis |
| LCCD | Linear Coupled-cluster (method With) Double (excitations) |
| PDSA | Peroxydisulfuric Acid |