| Acronym | Meaning |
| EPCIA | Evolving Principal Component Innovation Analysis |
| RSCA | Relativistic Semiclassical Approximation (for At. Scattering) |
| SCLS | Surface Core Level Shift |
| BATEA | Best Available Technology Economically Achievable |
| TDD | Telecommunications Device For The Deaf |
| STM | Scanning Tunneling Microscopy |
| LED | Longitudinal Eddy Current Delay |
| MS-RC(XI) | Multiple Scattering Relativistic Correlated (calcn. Method) |
| WAND | Wide Angle Neutron Diffraction |
| GLOSS | Global Sea Level Observing System (of IOC) |