| Acronym | Meaning |
| PSD | Post-source Decay |
| ALS | Antilymphocyte Serum |
| CDER | Center For Drug Evaluation And Research |
| VDHF | Variational Dirac-Hartree-Fock |
| CINDA | Computer Index Of Neutron Data |
| LTAVD | Low Temperature Arc Vapor Deposition |
| SZA | Solar Zenith Angle |
| APLI | Atmospheric Pressure Laser Ionization |
| SOFIA | Stratospheric Observatory For Infrared Astronomy |
| GCM | General Circulation Model |