Spdf
Spdf or SPDF may refer to:
- S/PDIF, a format for communicating digital audio across coaxial or fiber optic cabling.
- Electron configuration, for which there is an obsolete system of categorizing spectral lines as "sharp", "principal", "diffuse" and "fundamental"; also the names of the sub shells or orbitals
- The blocks of the periodic table, based on electron configuration as above.
- Seychelles People's Defence Force, the military of Seychelles
- Sudan People's Defense Forces/Democratic Front, a militia in South Sudan
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