| Acronym | Meaning |
| VPT | Variational Perturbation Theory |
| PWSA | Ports And Waterways Safety Act |
| NRFE | Normalised Relative Fit Error |
| REA | Relaxed Eddy Accumulation |
| SS-MR-CC | State-selective Multireference Coupled-cluster |
| IRS | Internal Recognition Subsequence |
| OASIS | Ocean And Atmospheric Sounding Interferometer System |
| IGOSS | Integrated Global Ocean Services System |
| APRF | Army Pulse Radiation Facility |
| PRS | Perturbed Rotational State (method For Ion-mol. Collisions) |