| Acronym | Meaning |
| ECIST | Estimated Chronic In Stream Toxicity |
| ERP | Effective Refractory Period |
| RNRA | Resonant Nuclear Reaction Analysis |
| 2DHG | Two Dimensional Hole Gas |
| GVDW | Generalized Van Der Waals (a Free-energy D.-functional Theory) |
| RITG | Radiatively Important Trace Gases |
| CINDORU | Unified Cluster INDO |
| MALT | Mucosa-associated Lymphoid Tissue |
| STCA | Simplified Traveling-cluster Approxn. (for Electronic Structure) |
| HOFF | Hybrid Orbital Force Field |