| Acronym | Meaning |
| CNDO/B | Complete Neglect Of Differential Overlap / Boyd |
| TDO | Truncated Diatomic Orbital (a MO) |
| MCH | Mean Cell Hemoglobin |
| RARE | Retinoic Acid-response Element |
| AIMD | Ab Initio Molecular Dynamics |
| LMO | Localized Molecular Spin Orbital |
| BRAHMS | Broad RAnge Hadron Magnetic Spectrometers |
| ROM | Read Only Memory |
| ADARD | Acid Deposition And Atmospheric Research Division |
| IAP | Islet-activating Protein |