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PD, P.D., or Pd may refer to:

Arts and media[edit]

Economics and business[edit]


Government and law[edit]


Political parties[edit]


Science, technology, and mathematics[edit]

Biology and medicine[edit]

Disorders and symptoms[edit]

Medical techniques and specialties[edit]

Other uses in biology and medicine[edit]

Computing and Electronics[edit]

  • Pentium D, a dual-core variant of the Pentium 4 processor
  • Perfect Dark (P2P), a Japanese peer-to-peer file-sharing (P2P) application designed for use with Microsoft Windows
  • Phase-change Dual, an optical media format
  • Pure Data the graphical audio-processing language
  • Photodiode, a semiconductor device that converts light into current

Other uses in science, technology, and mathematics[edit]

Other uses[edit]

  • Full stop (or period, in American English), used in coded military communications
  • Personal development, as used in the self-help and personal growth fields
  • Peu difficile, a French climbing/mountaineering grade

See also[edit]