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SD may refer to: SD

Arts and entertainment[edit]

  • Super deformed, an art style
  • Sans Date (no date), Used by French libraries for books without known date of publication.

Businesses and organizations[edit]


Science, technology, and mathematics[edit]

Electronics and computing[edit]


Other uses in science and technology[edit]

  • Spasmodic dysphonia, a voice disorder
  • Storm Data, an NOAA publication summarizing severe weather events in the United States
  • Subdwarf star, a star with luminosity 1.5 to 2 magnitudes lower than that of a main-sequence star of the same spectral type
  • Surface detector, a detector to measure secondary particles of cosmic-ray air showers on ground
  • System dynamics, an approach to understanding the nonlinear behavior of complex systems over time

Other uses[edit]

See also[edit]