| Acronym | Meaning |
| PANAK | Peroxyacetyl Nitrate Aldehyde Ketones |
| TRCF | Transcription-repair Coupling Factor |
| FIPS | Federal Information Processing Standard |
| SPC | Statistical Process Control |
| IPMA | Ion Probe Microanalysis |
| DBE | Distorted-wave Born Exchange |
| IERM | Intermediate Energy R-matrix (theory In Scattering Calcns.) |
| NFAIS | National Federation Of Abstracting And Information Services |
| CCD | Counter Current Decantation |
| NCWQ | National Commission On Water Quality |