Spdf

Spdf or SPDF may refer to:


 * 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
 * Discovered by a group of scientists named Sampad Panda,Shubham Shill, Stotrom Das, Subhajit Mandal,  & Srijan Pattanayak. They are collectively called Bound Together group.

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