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- Initialism of science fiction or speculative fiction, often used to avoid having to choose between the two.
- Initialism of square feet.
- (basketball) Initialism of small forward.
- Initialism of San Francisco.
- Initialism of Sinn Fein, an Irish political party
- Initialism of Suomi–Finland, former country code for Finland
- (video games) Initialism of Street Fighter.