| Acronym | Meaning |
| CIOS | Complex Infinite Order Sudden (approxn. In Quantum Calcns.) |
| CSOV | Constrained Space Orbital Variation |
| CITAC | Cooperation On International Traceability And Analytical Chemistry |
| CLOT | Carbon Layer Open Tubular (column) |
| NHLBI | National Heart |
| HETG | High-energy Transmission Grating |
| GSA | Generalized Sudden Approximation |
| PBDD | Polybrominated Dibenzodioxin(s) |
| PIB | Potential Induced Breathing (model In Electronic-structure Studies In Superconductors) |
| DOP | Dioctyl Phthalate |