| Acronym | Meaning |
| IRRAS | Integrated Reliability And Risk Analysis System |
| PBC | Periodic Bond Chain |
| TCVA | Total Culturable Virus Assay |
| IMOM | Iterative Method Of Maximum Overlap |
| MPD | Multiphoton Dissociation |
| ND | Nitrification Denitrification |
| RAM | Renormalized Atom Model (for Electronic-structure Calcns.) |
| MAK | Maximale Arbeitplatz Konzentration; Maximum Allowed Concentration At Workplace |
| REE | Rare Earth Element(s) |
| OBE | Optical Bloch Equation |