SO or so may refer to: Arts and entertainment Music So (album), an album by Peter Gabriel So (band), a duo from the 1980s formed by two members of The Opposition "So" (Static-X song), a song by Static-X "Sō (New Love New World)", a song by Masaharu Fukuyama "So", a song by War from Why Can't We Be Friends? "So", a song by Fates Warning from Disconnected S.O. (rapper) Other "SO" (Sons of Anarchy), the third season premiere of the FX television series Sons of Anarchy So Television, a British TV production company Relationships Significant other, a partner in an intimate relationship Businesses Austrian Air Services (former IATA airline designator SO) Sosoliso Airlines (former IATA airline designator SO) Southern Airways (former IATA airline designator SO) Southern Company (stock symbol SO) Superior Aviation (IATA airline designator SO) Language So language (Democratic Republic of Congo), a Bantu language Sô language, a Katuic language (Mon-Khmer) of Laos and Thailand Swo language, a Bantu language of Cameroon Soo language, a Kuliak language of Uganda Somali language (ISO 639 language code "so") So (kana), a Japanese kana So (word), an English word Places So, Iran, a village in Isfahan Province, Iran Canton of Solothurn, Switzerland So Phisai District, Bueng Kan Province, Thailand SO postcode area, UK, the Southampton postcode area Somalia (ISO 3166-1 alpha-2 country code SO) South Otago, part of New Zealand's South Island Southern State Parkway, a highway in New York, United States Science, technology, and mathematics Computing .so, the top-level Internet domain of Somalia .so, a filename extension for a shared object (a dynamic library or module) in Unix and Linux Shift Out, an ASCII control character in computing Small-outline integrated circuit StackOverflow, a programming Q&A site Mathematics SO (complexity), second-order logic in descriptive complexity Special orthogonal group, a subset of an orthogonal group SO(2), a term used in mathematics, the group of rotations about a fixed point in the Euclidean plane SO(3), a term used in mathematics, the group of rotations about a fixed point in three-dimensional Euclidean space SO(4), a term used in mathematics, the group of rotations about a fixed point in four-dimensional Euclidean space SO(5), a term used in mathematics, the special orthogonal group of degree 5 over the field R of real numbers SO(8), a term used in mathematics, the special orthogonal group acting on eight-dimensional Euclidean space Physics and chemistry Sulfur monoxide SO(10) (physics), a term