SD
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{{wiktionary|sd|SD|s.d.}}
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; {{langx|it|Sinistra Democratica|links=no}})
- Social Democrats (Slovenia) (founded 1993)
- Solidarity (Brazil) (founded 2012)
- Democratic Party (Poland) (founded 1937; {{langx|pl|Stronnictwo Demokratyczne|links=no}})
- Sweden Democrats (founded 1988)
- Swiss Democrats, Switzerland (renamed 1990; {{langx|de|Schweizer Demokraten|links=no}})
- Serbian Right (founded 2018; {{langx|sr-Latn|Srpska desnica|links=no}})
= 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
{{disambiguation}}