SO

SO or so may refer to:

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

Biology

 * Syndromic obesity

Computing

 * .so, the top-level Internet domain of Somalia
 * , 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 used in particle physics, one of the grand unified theories is based on the SO(10) Lie group

Names

 * Sō, a Japanese surname and given name
 * Su (surname) (苏/蘇), a Chinese surname and a Korean surname (소) derived from it
 * So (Korean name) (蘇 or 邵)

Other uses

 * So (סוֹא), King of Egypt, usually identified with Osorkon IV
 * So (dairy product), a type of dairy product made in ancient Japan
 * Sales order, an order received by a business from a customer
 * Sao civilisation or So, an African civilisation and population that flourished from ca. the 6th century to ca. 15th century
 * Shell on, a form of presentation in shrimp marketing
 * Strikeout, in baseball