Set

Science, technology, and mathematics

Set (mathematics), a collection of elements
Category of sets, the category whose objects and morphisms are sets and total functions, respectively

Set (abstract data type), a data type in computer science that is a collection of unique values
- Set (C++), a set implementation in the C++ Standard Library
Set (command), a command for setting values of environment variables in Unix and Microsoft operating-systems
Secure Electronic Transaction, a standard protocol for securing credit card transactions over insecure networks
Single-electron transistor, a device to amplify currents in nanoelectronics
Single-ended triode, a type of electronic amplifier
Set!, a programming syntax in the scheme programming language

Set (psychology), a set of expectations which shapes perception or thought
Set or sett, a badger's den
Set, a small tuber or bulb used instead of seed, especially:
- Potato set
- Onion set
SET (gene), gene for a human protein involved in apoptosis, transcription and nucleosome assembly
Single Embryo Transfer, used in in vitro fertilization

A chemical change in an adhesive from unbonded to bonded
- Set, to make/become solid; see Solidification
Stress–energy tensor, a physical quantity in the theory of fields
Single electron transfer

Saw set, the process of setting the teeth of a saw so each tooth protrudes to the side of the blade
Scalar expectancy theory, a model of the processes that govern behavior controlled by time
Science, Engineering & Technology, e.g. The Science, Engineering & Technology Student of the Year Awards
Setting (typesetting), the act of typesetting a publication for print or display
Simulated Emergency Test, an amateur radio training exercise
Software Engineer in Test, a Quality Assurance job title in some software companies
Strategic Energy Technologies Plan of the European Union
Suzuki SET, Suzuki Exhaust Tuning of motorcycles
Set Catena, a pit chain on Neptune's largest moon Triton

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Arts and entertainment

Set (comics), the chief deity of the Stygian people in Robert E. Howard's stories of Conan the Barbarian and the later Marvel comics series

Set, the basic square formation in square dancing
Set, the basic longwise, square or triangular formation in Scottish Country dancing
Set, the basic formation of more than one couple in Scottish, English and Irish Céilidh

Set (film and TV scenery)
Theatrical scenery
Set construction, construction of scenery for theatrical, movie, television production, and video game production
The Set (film), a 1970 Australian movie
The Set (TV series), an Australian music television show
Sanlih Entertainment Television, a television channel in Taiwan
Sony Entertainment Television, a Hindi-language television channel

DJ set or DJ mix, a musical performance by a DJ
Set theory (music), dealing with concepts for categorizing musical objects and describing their relationships
Set (music), a collection of discrete entities, for example pitch sets, duration sets, and timbre sets
Set (Thompson Twins album)
Set (Alex Chilton album)
Set list, a list of songs to be played during musical performances
"Set", a song from King Gizzard & the Lizard Wizard's 2023 album The Silver Cord

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Businesses and organizations

Societatea Pentru Exploatări Tehnice, a Romanian aeronautics company of the 1920s to 1940s
South Eastern Trains, former train operator England
Stock Exchange of Thailand, the national stock exchange of Thailand
SET Index, an index for the Stock Exchange of Thailand
South Eastern Trust, Northern Irish health organization
Study of Exceptional Talent, a program for gifted students
Sydney Electric Train Society, an electric train preservation society in Sydney, Australia

Sport and games

Set (darts), a sequence of games
Set (card game)
Set (cards), two or more cards of the same rank
- Three of a kind (poker), a type of poker hand
Set (dominoes), the first play in dominoes
Set, a signal used in American football
The set, a pitching position in baseball
Set, a unit of play in tennis
Set, a team's second contact with the ball in volleyball
Set, a group of repetitions in weight training
Set (video game), a group of items that adds specific bonuses

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Other uses

Set and setting, coined by Timothy Leary to describe the mindset and location of hallucinogenic experiences
Seṭ and aniṭ roots, in Sanskrit grammar
Set (river), a river in northeastern Spain
Selective Employment Tax, a tax in the United Kingdom from 1966 to 1973
Senate Electoral Tribunal, decides election protests for the Senate of the Philippines
A set, set meal, set menu, or table d'hôte: a meal offered at a fixed price
Set (gang), a subgroup of a gang alliance

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Science, technology, and mathematics