| Acronym | Meaning |
| ODCPA | Off-diagonal (disorder) Coherent-potential Approxn. |
| ESMS | Electrospray Ionization Mass Spectrometry |
| HSCR | Hirschsprung Disease |
| OSWER BBS | OSWER Electronic Bulletin Board System (see CLU-IN) |
| EINP | Energy-independent Nonlocal Pseudopotential |
| NDDO | Neglect Of Diatomic Differential Overlap |
| TDS | Total Dissolved Solids |
| IASC | International Arctic Science Committee |
| MIPMS | Microwave Induced Plasma Mass Spectrometry |
| AAR | Association Of American Railroads |