| Acronym | Meaning |
| ABWR | Advanced Boiling Water Reactor |
| ICLS | Intracavity Laser Spectroscopy |
| SCID | Severe Combined Immunodeficiency |
| EPI | Electronic Patent Index |
| TWTA | Traveling Wave Tube Amplifier |
| NIESST | Nuclear Decay-induced Excited-spin-state Trapping |
| CATSI | Compact Atmospheric Sounding Interferometer |
| QC-SCF | Quadratically Convergent SCF (for Closed-shell Systems) |
| ESRIN | European Space Research Institute |
| PML | Polymer Multi Layer |