| Acronym | Meaning |
| NN-TB | Nearest-neighbor Tight Binding |
| AXAF | Advanced X-ray Astrophysics Facility |
| SURE | Sulfate Regional Experiment |
| FRC | Free Residual Chlorine |
| NCWQ | National Commission On Water Quality |
| ESIX | Electrically Switched Ion Exchange |
| MMSE | Minimum Mean Square Error |
| MFP | Mean Free Path |
| VA-HOMO | Vibrationally Active HOMO |
| LEACH | Leaching Evaluation Of Agricultural Chemicals |