# Set

Set, The Set, SET or SETS may refer to:

## Science, technology, and mathematics
### Mathematics

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

### Electronics and computing

* 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

### Biology and psychology

* 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

### Physics and chemistry

* 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

### Other uses in science and technology

* 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

## Arts and entertainment
### Comics and literature

* 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

### Dance

* 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

### Film, television and theatre

* 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

### Music

* 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

## 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

## Religion

* Set (deity) or Seth, an ancient Egyptian deity
* Set or Seth, a Biblical character, a son of Adam and Eve

## 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

## 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