| Acronym | Meaning |
| HCS | Heliospheric Current Sheet |
| QLSM | Quadratic Least-squares Method (variational For Scattering) |
| ROS | Restricted (or Roothaan) Open-shell (Hamiltonian) |
| HFB SCF RPA | Hartree Fock Bogolyubov SCF Random Phase Approximation |
| LIT | Linear Ion Trap |
| AISIT | Automatic Intelligent Sampler For Inorganic Trace Constituents |
| LIFT | Laser Induced Forward Transfer |
| TRACS | Trends In Atmospheric Constituents Study |
| PVS | Performance Verification Sample |
| HEP | High Energy Physics |