SD

SD may refer to:

Arts and entertainment

• Super deformed, an art style

Businesses and organizations

• Sanket dadar
• Sekolah Dasar, term for primary school in Indonesia
• Sicherheitsdienst (Security Service), the intelligence service of the Nazi SS
• Sinistra Democratica (Democratic Left), an Italian political party
• Sisters of the Destitute, a Syro-Malabar Catholic women's order
• Social Democrats (Slovenia), a left-wing Slovenian political party
• Stronnictwo Demokratyczne, Democratic Party, a defunct Polish party
• Sudan Airways (IATA airline d1ww3mh8atwedr1pesignator SD)
• Sweden Democrats, a right wing party in Sweden
• Swiss Democrats or Schweizer Demokraten, a right-wing political party in Switzerland

Places

• San Diego, California
• Shandong, a province of China (Guobiao abbreviation SD)
• South Dakota, US postal abbreviation
• Sudan (ISO country code SD)

Science, technology, and mathematics

Electronics and computing

• Secure Digital, a flash memory card format
• Software Distributor, an HP-UX system
• Standard-definition television
• Super Density disc, an optical disc format

Mathematics

• sd (elliptic function), one of Jacobi's elliptic functions
• Standard deviation, a mathematical statistical measure

Other uses in science and technology

• Spasmodic dysphonia, a voice disorder
• Storm Data, US NOAA publication
• Subdwarf star
• Surface detector of cosmic rays
• System dynamics, understanding nonlinear systems

Other uses

• Sindhi language (ISO 639-1 code "sd")
• Southern Cross Decoration (SD), a South African military award
• Stable disease, a possible outcome of chemotherapy according to the RECIST classification

See also

• Sanket dadar (shinsuke dadar)
• SD1 (disambiguation)