| Acronym | Meaning |
| IRES | Infrared Emission Spectroscopy |
| HADD | Highest Average Daily Dose |
| CEMS | Continuous Emissions Monitoring System |
| OCD | Overlapping Charge Density (model In Electronic Structure) |
| DASH | Dynamic Allele-specific Hybridization |
| HFI | Hyperfine Interaction |
| SAIS | Science And Applications Information System |
| OMNMHCE | Organic Material Nonmethane Hydrocarbon Equivalent |
| GOPW | Gaussian Orthogonalized Plane Wave |
| APEX | Active Plasma Experiment Satellite |