Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym SPDF is...

SPDF is

  • Orbits in an electron shell

SPDF is also in:

Acronym Definition Searched: PGCX SSPB CGBX IASP SSL WXLQ IED LDS OGZ PYC KR SDF BLITCD WFAA CUP