| Acronym | Meaning |
| EHB | Extended Hubbard (hamiltonian) |
| TROLS | Terrestrial And Riparian Organisms |
| NTDB | National Trade Databank |
| RSRG | Real-space Renormalization Group (method In Calcn. Of Green Functions For Electrons In Crystals) |
| IBAD | Ion-Beam-Assisted Deposition |
| TMJ | Temporomandibular Joint |
| NAIMA | North American Insulation Manufacturers Association |
| XCC | Expectation-value Coupled-cluster (in Correlation Energies And Electronic Properties Of Many-electron Systems Calcns.) |
| ARA | Aggregate Risk Analysis |
| EFH | Extended Fenske-Hall (LCAO MO Method) |