| Acronym | Meaning |
| TDD | Telecommunications Device For The Deaf |
| QHA | Quasi-harmonic Approxn. (in Intramol. Vibrational Relaxation) |
| IPDA | Intensified Photodiode Arrays |
| CEARC | Canadian Environmental Assessment Research Council |
| SIMR | Swedish Institute For Metals Research |
| HSF | Hiller-Sucher-Feinberg (equation For Calcn. Of Spin Densities And Charge Densities In Mols.) |
| ADR | Adverse Drug Reaction |
| DRI | Direct Reduced Iron |
| TCA | Traveling-cluster Approximation (a Generalization Of CPA For Electronic-structure Of Alloys) |
| CTAC | Counterdrug Technology Assessment Center |