SA
SA or sa may stand for:
- Arsine, a toxic gas
- S.A. (corporation) (e.g. Société Anonyme (France) or Sociedad Anónima (Spain))
- Samarium until the 1920s, when the symbol Sm became universal
- Salvation Army
- San Antonio
- Saudi Arabia (ISO country code)
- Seaman apprentice
- Selective Availability, the mechanism for deliberately degrading the precision of the civilian GPS network
- Sine anno, used in bibliographies to indicate that a publication date is unknown
- Social anxiety (also known as "social phobia" or "social anxiety disorder")
- Socialist Alliance
- South Africa
- South America
- South Australia
- Structured analysis (software engineering)
- Sturmabteilung (Storm Troopers as in Nazi Germany)
- Surface-to-air missile
- System administrator (computer industry)
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