SF may refer to: Locations San Francisco, California, United States Sidi Fredj, Algeria South Florida, an urban region in the United States Suomi Finland, former vehicular country code for Finland In arts and entertainment Genres Speculative fiction (usually sf) Science fiction or sci-fi (usually SF) In film and television , the Swedish film industry SF Film Finland, a Finnish film distributor SF Channel (Australia) , a German-language television network in Switzerland , a Finnish film production company In music Sforzando (musical direction) or sf, a musical accent Subito forte, a musical notation for dynamics (music) Switchfoot, a band Sasha Fierce, on-stage alter ego of American entertainer Beyoncé, and namesake of her album I Am... Sasha Fierce Other media Saikoro Fiction, a Japanese role-playing game system Street Fighter, a series of fighting video games by Capcom Businesses and organizations In politics Salzburg Forum, European security intergovernmental organization Sinn Féin, an Irish political party , a political party in Denmark , a splinter group of the Norwegian Labour Party Other businesses and organizations , a type of Norwegian state enterprise SF Express, a Chinese multinational delivery services and logistics company SF Airlines, a Chinese cargo airline owned by SF Express Salesforce, an American cloud computing company specializing in customer resource management SourceForge, a web-based service that offers a source code repository, download mirrors, bug tracking and other features Space forces, military service branches for space operations Special forces, military units trained to perform unconventional missions State Farm, an American insurance company Tassili Airlines (IATA designator SF) Six Flags A common shorthand for "Standard Form", a designation used by the United States Office of Personnel Management for forms used across various government agencies In science, math, and engineering Significant figures, numeric digits contributing meaningfully to measurement resolution Safety factor, the capacity of a system beyond expected or actual loads Spontaneous fission, a form of radioactive decay found in very heavy elements Square foot, unit of area Stacking fault, a dislocation in a crystal S.F., an acronym name for stick figures In sports A common abbreviation for the U.S. city of San Francisco, California's major professional sports teams: San Francisco 49ers, the city's National Football League team San Francisco Giants, the city's Major League Baseball team Small forward, a position in basketball Stade Français, a French rugby union team based in Paris Superleague Formula, a former motorsport racing series Super Formula Championship, a Japanese