Spdf
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Spdf or SPDF may refer to:
- S/PDIF, a format for communicating digital audio across coaxial or fiber optic cabling.
- Letters indicating sequential subshells in an electron configuration, inherited from an obsolete system of categorizing spectral lines as sharp, principal, diffuse or fundamental.
- 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