| Acronym | Meaning |
| NDA | Nondestructive Assay |
| HDF | Hubble Deep Field |
| NITS | National Institute Of Technology And Standards |
| XRFA | X-ray Fluorescence Analysis |
| CDRH | Center For Devices And Radiological Health |
| LCRA | Linear Combination Of Rydberg Orbitals |
| ACP | Approximate Coupled-pair (method For Correlation-energy Calcn.) |
| ASCII | American Standard Code For Information Interchange |
| PDA | Photodiode Array |
| EPKR | Electrochem. Polarization Kinetic Reactivation |