Arts, media and entertainment

Initialism for "soprano and alto", voice types for which a piece of music is written
SA (Samurai Attack), a Japanese punk rock band
SA Martinez, a vocalist and DJ for the band 311
Soziedad Alkoholika, a Spanish punk rock band
SA, a 2018 album by Jonathan Richman

Language and writing

Sa (cuneiform), a cuneiform sign
sa (hieroglyph), an Egyptian hieroglyph meaning "protection"
Sa (kana) (さ and サ), characters (kana) in the two Japanese syllabaries
Saa language, spoken in Vanuatu
Sanskrit (ISO 639-1 code: sa), a historical Indo-Aryan language, the liturgical language of Hinduism
Sine anno, Latin term for "without year" used in bibliographies to indicate items which do not record the year of publication
Sub anno (s.a. or sa), Latin term for "under the year" in annals which record by year
Sa (Javanese) (ꦱ), a character in the Javanese script

Soviet Army, army of the Soviet Union
Sturmabteilung (SA), a paramilitary wing of the German Nazi Party (NSDAP), also known as the Brownshirts

System Architect, an enterprise architecture product
S.A. (corporation) (French: Société Anonyme) a type of corporation in various countries
San Antonio Spurs, a basketball team in the U.S. National Basketball Association
The Salvation Army, an international church and charity
Sexaholics Anonymous, a sex-addiction recovery group based on the 12 steps of Alcoholics Anonymous
Shooting Australia, governing body for target shooting sports in Australia
Smokers Anonymous
South African Airways (IATA airline designator: SA)
Sports Authority, a defunct U.S. sporting goods retailer
Success Academy Charter Schools, term commonly abbreviated to 'Success Academy'

.sa, the country code top level domain (ccTLD) for Saudi Arabia
Security association in the IPsec networking protocol
Selective availability, a mechanism for degrading the precision of the civilian GPS network
Simulated annealing, an optimisation technique
Software architect
Software architecture
Microsoft Software Assurance
Structured analysis, a software engineering technique
Suffix array, a sorted array of all suffixes of a string
System administrator
System architecture
Systems analysis
Systems analyst
System agent

Sa (Islamic measure), Arabic measure of volume
Samarium (former chemical symbol: Sa), a rare earth metal
Single action, a type of firearm trigger
Situation awareness, a component of aviation safety and other socio-technical systems
Spectral acceleration, in seismology and earthquake engineering
Superabundant number, a type of number (mathematical concept)
Unbarred spiral galaxy
Short axis, in single-photon emission computed tomography
Surface area

Sa (Mandaeism), a type of Mandaean sacramental bread that is rolled up
Seaman apprentice, a U.S. Navy and Coast Guard rank
Secrecy agreement, a legal contract for confidentiality
Sex appeal, attraction on the basis of sexual desire
Sexual assault, the intentional act of sexually touching another person without their consent
Share-alike, a term used in Creative Commons licensing
Second Amendment to the constitutions of several sovereign states and subnational entities
- Second Amendment to the United States Constitution, the most common meaning of "Second Amendment"
Single adult (LDS Church), a designation in The Church of Jesus Christ of Latter-day Saints for unmarried individuals 18 and older; sometimes used specifically to refer to unmarried individuals over 30
Special agent, a position usually held by investigative officers within certain law enforcement agencies in the United States
San Andreas (disambiguation)