| Acronym | Meaning |
| IMS | Incomplete Model Space (in Many-body Calcns.) |
| HCA | Hierarchical Cluster Analysis |
| HUGO | Human Genome Organization |
| MIA | Multiplicative Integral Approxn. (in 2-electron Integral Calcn.) |
| LLC | Lyotropic Liquid Crystal |
| SEREX | Serological Identification Of Antigens By Recombinant Expre |
| HOCO | Highest Occupied Crystal Orbital |
| IIW | International Institute Of Welding |
| CAS-CI | Complete Active Space-configuration Interaction |
| CBS | Complete Basis Set |