| Acronym | Meaning |
| ZLC | Zero Length Column |
| RAIN | Reactions And Intermediates Network |
| MNDOD | Modified Neglect Of Diatomic Overlap With D At. Orbitals |
| HI | Hydrogen Index |
| SAMSON | Severe Accident Management System Online Network |
| RATM | Renormalized Average T-matrix (for D.-of-states Calcns.) |
| CMR-CI | Contracted Multireference Configuration Interaction |
| PTGF | Perturbative-type Green Function |
| CCMSD | Computational Center For Molecular Structure And Design |
| CPPA | Canadian Pulp And Paper Association |