| Acronym | Meaning |
| MNDO | Modified Neglect Of Diatomic Overlap |
| AQCS | Analytical Quality Control Services |
| CMF | Crossflow Microfiltration |
| SAMI | Southern Appalachian Mountains Initiative |
| SCBSA | Self-consistent Boundary-site Approxn. (for D.-of-states) |
| FRAM | Ferroelectric Random Access Memory |
| ZBL | Ziegler, Biersack And Littmark |
| ACIS | Advanced CCD Imaging Spectrometer |
| MORTI | Mesopause Oxygen Rotational Temp. Imager |
| ORD BBS | ORD Electronic Bulletin Board System |