| Acronym | Meaning |
| RTD | Residence Time Distribution |
| SPES | Step Potential Electrochemical Spectroscopy |
| HMXB | High-mass X-ray Binaries |
| APSG | Antisymmetrized Product Of Spin Geminals Method |
| MTOF | Mass Time-Of-Flight |
| SAPT | Symmetry-adapted Perturbation Theory |
| SCM | Shell-correction Method (in Calcns. For Metal Clusters) |
| WMO | World Meteorological Organization |
| EXOSAT | European X-ray Observatory Satellite |
| SALI | Secondary Atom Laser Ionization |