| Acronym | Meaning |
| RXES | Resonant X-ray Emission Spectra |
| TES | Tropospheric Emission Spectrometer |
| EPCIA | Evolving Principal Component Innovation Analysis |
| COP | Cyclic Olefin Polymers |
| API | Air Pollution Index |
| EDC | Endocrine Disrupting Chemical |
| DGE | Differential Gene Expression |
| APHIS | Animal And Plant Health Inspection Service |
| ETSAP | Energy Technology Systems Analysis Program |
| QAPW | Quadratic Augmented Plane Wave (in Band-structure Calcn.) |