SD

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REDIRECT Template:Protection padlock

Template:Rcat shell Template:Sister project SD may refer to:

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Military and weaponry

Smith & Wesson SD, a line of pistol (first made 2010)
SD radar, an early US Navy radar system
Southern Cross Decoration (SD), a South African military award

Organisations

Political parties

Democratic Left (Italy) (2007–2010; Template:Langx)
Social Democrats (Slovenia) (founded 1993)
Solidarity (Brazil) (founded 2012)
Democratic Party (Poland) (founded 1937; Template:Langx)
Sweden Democrats (founded 1988)
Swiss Democrats, Switzerland (renamed 1990; Template:Langx)
Serbian Right (founded 2018; Template:Langx)

Other organisations

Sicherheitsdienst, Nazi intelligence service (1931–1945)
Sisters of the Destitute, a Syro-Malabar Catholic order (founded 1927)
Sudan Airways (founded 1946; IATA:SD)

Places

Sudan (ISO 3166 country code:SD)
A common abbreviation for the U.S. city of San Diego, California and the San Diego Padres—the city's Major League Baseball team
Shandong, a province of China
South Dakota, a US state
Eswatini (formerly Swaziland; SD on vehicle plates)

Science and technology

Astronomy

Subdwarf, a class of star
Surface detector, of cosmic rays at the Pierre Auger Observatory

Electronics and computing

SD card (Secure Digital), a flash memory card format
Software Distributor, an HP-UX system
Standard-definition television
Super Density Disc, an optical disc format
Stable Diffusion, a text-to-image generator

Mathematics

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

Medicine

Spasmodic dysphonia, a voice disorder
Stable disease, a RECIST chemotherapy outcome

Other uses in science and technology

Service design, holistic design of service experience
Spiral Dynamics, a model of individual and societal development
Storm Data, a US meteorological journal
System dynamics, of nonlinear systems

Other uses

Sekolah Dasar, term for primary school in Indonesia
Super D (cycling), a class of mountain bike race
Super deformed, an art style
Sindhi language (ISO 639-1 code: sd)
sine die, Latin, undated (literally without a day)

See also

SD1 (disambiguation)

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