Spdf

Spdf or SPDF may refer to:

Sony/Philips/ Digital/(interface)Format.

For connecting a T.V. to an external speaker/soundbar etc.

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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