| Acronym | Meaning |
| ETB | Extended Tight-binding (method For Electronic-structure Calcns.) |
| SAC | Self-Aligned Contact |
| WDM | Wavelength Division Multiplexing |
| QCP | Quantized Classical Path (method For Calcg. Quantum-mech. Rate Consts.) |
| HTP | Helical Twisting Power |
| CBC | Circulating Bed Combustor (or Incinerator) |
| MRCI | Multireference Configuration Interaction |
| HSDB | Hazardous Substances Data Bank (NLM) |
| DIGE | Deuteron Induced Gamma-ray Emission |
| NAWDEX | National Water Data Exchange |