| Acronym | Meaning |
| ETB | Extended Tight-binding (method For Electronic-structure Calcns.) |
| IEM | Immunoelectron Microscopy |
| SOI | Silicon On Insulator |
| SUSIM | Solar Ultraviolet Spectral Irradiance Monitor |
| IETS | Inelastic Electron Tunneling Spectroscopy |
| EWPCA | European Water Pollution Control Association |
| ICDH | Isocitrate Dehydrogenase |
| LIOAS | Laser-induced Optoacoustic Spectroscopy |
| SRC | Synchrotron Radiation Center |
| NCHS | National Center For Health Statistics |