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 The term significant other (SO) has different uses in psychology and colloquial language. Colloquially, "significant other" is used as a gender-neutral term for a person's partner in an intimate relationship without disclosing or presuming a ...

, 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 Southern Company is an American gas and electric utility holding company based in the Southern United States. It is headquartered in Atlanta, Georgia, with executive offices located in Birmingham, Alabama. As of 2021 it is the second largest ut ...

(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 Swo is a Bantu language The Bantu languages (English: , Proto-Bantu language, Proto-Bantu: *bantʊ̀), or Ntu languages are a language family of about 600 languages of Central Africa, Central, Southern Africa, Southern, East Africa, Easter ...

, a Bantu language of Cameroon * Soo language, a Kuliak language of Uganda *

Somali language Somali is an Afroasiatic languages, Afroasiatic language belonging to the Cushitic languages, Cushitic branch, primarily spoken by the Somalis, Somali people, native to Greater Somalia. It is an official language in Somalia, Somaliland, and Ethio ...

(ISO 639 language code "so") *

So (kana) そ, in hiragana, or ソ, in katakana, is one of the Japanese kana, each of which represents one Mora (linguistics), mora. Both represent . The version of this character used by computer fonts does not match the handwritten form that most nativ ...

, a Japanese kana *

So (word) ''So'' is an English word that, apart from its other uses, has become increasingly popular in recent years as a coordinating conjunctive opening word in a sentence. This device is particularly used when answering questions although the questioner m ...

, an English word

Places

So, Iran Soh (; also known as Sō and Sūh) is a village in Murcheh Khvort Rural District, in the Central District of Shahin Shahr and Meymeh County, Isfahan Province, Iran Iran, officially the Islamic Republic of Iran (IRI) and also known as ...

, a village in Isfahan Province, Iran *

Canton of Solothurn The canton of Solothurn or canton of Soleure (; ; ; ) is a Cantons of Switzerland, canton of Switzerland. It is located in the northwest of Switzerland. The capital is Solothurn. History The village of ''Salodurum'' was founded in the time of t ...

, Switzerland * So Phisai District, Bueng Kan Province, Thailand *

SO postcode area The SO postcode area, also known as the Southampton postcode area, is a group of 23 postcode districts in southern England, within nine post towns. These cover south and central Hampshire, including Southampton, Winchester, Alresford, Brockenh ...

, UK, the Southampton postcode area *

Somalia Somalia, officially the Federal Republic of Somalia, is the easternmost country in continental Africa. The country is located in the Horn of Africa and is bordered by Ethiopia to the west, Djibouti to the northwest, Kenya to the southwest, th ...

(ISO 3166-1 alpha-2 country code SO) *

South Otago South Otago lies in the south east of the South Island of New Zealand. As the name suggests, it forms the southernmost part of the geographical region of Otago. The exact definition of the area designated as South Otago is imprecise, as the area ...

, part of New Zealand's South Island *

Southern State Parkway The Southern State Parkway (also known as the Southern State or Southern Parkway) is a controlled-access parkway on Long Island, New York, in the United States. The parkway begins at an interchange with the Belt and Cross Island parkways ...

, a highway in New York, United States

Science, technology, and mathematics

Biology and medicine

Syndromic obesity Syndromic obesity (SO) refers to obesity when it occurs as part of a syndrome, often along with intellectual disability. Often syndromic obesity is mediated by abnormal development of the hypothalamus The hypothalamus (: hypothalami; ) is a ...

, excess body fat occurring as part of a syndrome *

Sphincter of Oddi The sphincter of Oddi (SO) (also hepatopancreatic sphincter or Glisson's sphincter), is a sphincter, a muscular valve that, in humans and some animals, controls the flow of bile and pancreatic juice out of the gallbladder and pancreas respective ...

, a muscular valve of the duodenum

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 In software, a stack overflow occurs if the call stack pointer exceeds the stack bound. The call stack may consist of a limited amount of address space, often determined at the start of the program. The size of the call stack depends on many fac ...

, a programming Q&A site *

Sony is a Japanese multinational conglomerate (company), conglomerate headquartered at Sony City in Minato, Tokyo, Japan. The Sony Group encompasses various businesses, including Sony Corporation (electronics), Sony Semiconductor Solutions (i ...

's mobile phones in Japan

Mathematics

SO (complexity) In logic and mathematics, second-order logic is an extension of first-order logic, which itself is an extension of propositional logic. Second-order logic is in turn extended by higher-order logic and type theory. First-order logic quantifies onl ...

, second-order logic in descriptive complexity * Special orthogonal group, a subset of an

orthogonal group In mathematics, the orthogonal group in dimension , denoted , is the Group (mathematics), group of isometry, distance-preserving transformations of a Euclidean space of dimension that preserve a fixed point, where the group operation is given by ...

SO(2) In mathematics, the circle group, denoted by \mathbb T or , is the multiplicative group of all complex numbers with absolute value 1, that is, the unit circle in the complex plane or simply the unit complex numbers \mathbb T = \. The circle g ...

, a term used in mathematics, the group of rotations about a fixed point in the Euclidean plane **

SO(3) In mechanics and geometry, the 3D rotation group, often denoted SO(3), is the group of all rotations about the origin of three-dimensional Euclidean space \R^3 under the operation of composition. By definition, a rotation about the origin is a ...

, a term used in mathematics, the group of rotations about a fixed point in three-dimensional Euclidean space **

SO(4) In mathematics, the group (mathematics), group of rotations about a fixed point in four-dimensional space, four-dimensional Euclidean space is denoted SO(4). The name comes from the fact that it is the special orthogonal group of order 4. In this ...

, 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 **

\mathfrak(n)

, the corresponding special orthogonal Lie algebra

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) Su is the pinyin romanization of Chinese, romanization of the list of common Chinese surnames, common Chinese surname written in simplified characters and traditional characters, traditionally. It was listed 42nd among the Song dynasty, Song-er ...

(/), a Chinese surname and a Korean surname () 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 {{onesource, date=December 2018 The sales order, sometimes abbreviated as SO, is an order issued by a business or sole trader to a customer. A sales order may be for products and/or services. Given the wide variety of businesses, this means that t ...

, an order received by a business from a customer *

Sao civilisation The Sao civilization (also called So) flourished in Central Africa from the 6th century BCE or 5th century BCE, to as late as the 16th century AD. The Sao lived by the Chari River basin in territory that later became part of Cameroon and Chad. The ...

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 or softball, a strikeout (or strike-out) occurs when a batter accumulates three strikes during a time at bat. It means the batter is out, unless the third strike is not caught by the catcher and the batter reaches first base safe ...

, in baseball