may refer to:

Science and technology

Astronomy

Cluster (spacecraft) Ariane flight V88 was the failed maiden flight of the Arianespace Ariane 5 rocket, vehicle no. 501, on 4 June 1996. It carried the Cluster spacecraft, a constellation of four European Space Agency research satellites. The launch ended in fai ...

, constellation of four European Space Agency spacecraft * Asteroid cluster, a small asteroid family *

Cluster II (spacecraft) Cluster II is a space mission of the European Space Agency, with NASA participation, to study the Earth's magnetosphere over the course of nearly two solar cycles. The mission is composed of four identical spacecraft flying in a tetrahedral for ...

, a European Space Agency mission to study the magnetosphere * Galaxy cluster, large gravitationally bound groups of galaxies, or groups of groups of galaxies *

Supercluster A supercluster is a large group of smaller galaxy clusters or galaxy groups; they are among the largest known structures in the universe. The Milky Way is part of the Local Group galaxy group (which contains more than 54 galaxies), which in t ...

, the largest gravitationally bound objects in the universe, composed of many galaxy clusters * Star cluster ** Globular cluster, a spherical collection of stars whose orbit is either partially or completely in the halo of the parent galaxy **

Open cluster An open cluster is a type of star cluster made of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age. More than 1,100 open clusters have been discovered within the Milky Way galaxy, and ...

, a spherical collection of stars that orbits a galaxy in the galactic plane

Biology and medicine

* Cancer cluster, in biomedicine, an occurrence of a greater-than-expected number of cancer cases *

Cluster headache Cluster headache (CH) is a neurological disorder characterized by recurrent severe headaches on one side of the head, typically around the eye(s). There is often accompanying eye watering, nasal congestion, or swelling around the eye on the aff ...

, a neurological disease that involves an immense degree of pain *

Cluster of differentiation The cluster of differentiation (also known as cluster of designation or classification determinant and often abbreviated as CD) is a protocol used for the identification and investigation of cell surface molecules providing targets for immunophen ...

, protocol used for the identification and investigation of cell surface molecules present on white blood cells *

Winter cluster In beekeeping, a winter cluster is a well-defined cluster of honey bees that forms inside a beehive when the air temperature dips below 10 to 14 °C (50 to 57 F). Honey bees are one of but a few kinds of insects that survive the winter as a co ...

, in beekeeping, a well-defined cluster of honey bees in cold temperatures * Disease cluster, a grouping of cases of disease *

Gene cluster A gene family is a set of homologous genes within one organism. A gene cluster is a group of two or more genes found within an organism's DNA that encode similar polypeptides, or proteins, which collectively share a generalized function and ar ...

, a group of genes (or proteins, or metabolites) whose expression or concentration is similar across a range of conditions * Cluster of microorganisms, as in a

colony In modern parlance, a colony is a territory subject to a form of foreign rule. Though dominated by the foreign colonizers, colonies remain separate from the administration of the original country of the colonizers, the '' metropolitan state'' ...

Computer science

Computer cluster A computer cluster is a set of computers that work together so that they can be viewed as a single system. Unlike grid computers, computer clusters have each node set to perform the same task, controlled and scheduled by software. The comp ...

, a set of computers that work together *

Data cluster In computer disk storage, a sector is a subdivision of a track on a magnetic disk or optical disc. Each sector stores a fixed amount of user-accessible data, traditionally 512 bytes for hard disk drives (HDDs) and 2048 bytes for CD-ROMs and DVD ...

, a group of disk sectors used in a File Allocation Table

Statistics

Cluster analysis Cluster analysis or clustering is the task of grouping a set of objects in such a way that objects in the same group (called a cluster) are more similar (in some sense) to each other than to those in other groups (clusters). It is a main task of ...

, a set of techniques for grouping a set of objects based on intrinsic similarities * Cluster sampling, a sampling technique used when "natural" groupings are evident in a statistical population * Clusterable graph, in

balance theory In the psychology of motivation, balance theory is a theory of attitude change, proposed by Fritz Heider. It conceptualizes the cognitive consistency motive as a drive toward psychological balance. The consistency motive is the urge to maintain ...

Other uses in science and technology

* CLUSTER, the Consortium Linking Universities of Science and Technology for Education and Research *

Cluster (physics) In physics, the term clusters denotes small, polyatomic particles. As a rule of thumb, any particle made of between 3×100 and 3×107 atoms is considered a cluster. The term can also refer to the organization of protons and neutrons within an at ...

, a small group of atoms or molecules *

Cluster bomb A cluster munition is a form of air-dropped or ground-launched explosive weapon that releases or ejects smaller submunitions. Commonly, this is a cluster bomb that ejects explosive bomblets that are designed to kill personnel and destroy vehic ...

, a type of air-dropped or ground-launched shells *

Cluster chemistry In chemistry, an atom cluster (or simply cluster) is an ensemble of bound atoms or molecules that is intermediate in size between a simple molecule and a nanoparticle; that is, up to a few nanometers (nm) in diameter. The term ''microclus ...

, an array of bound atoms intermediate in character between a molecule and a solid *

Consonant cluster In linguistics, a consonant cluster, consonant sequence or consonant compound, is a group of consonants which have no intervening vowel. In English, for example, the groups and are consonant clusters in the word ''splits''. In the education fi ...

, in linguistics *

Language cluster A dialect continuum or dialect chain is a series of language varieties spoken across some geographical area such that neighboring varieties are mutually intelligible, but the differences accumulate over distance so that widely separated varie ...

or dialect cluster, a geographic distribution of languages *

Instrument cluster For business applications, see Dashboard (business). A dashboard (also called dash, instrument panel (IP), or fascia) is a control panel set within the central console of a vehicle or small aircraft. Usually located directly ahead of the drive ...

of an automobile * A bicycle cogset, either a freewheel, or cassette * The set of tubes attached to a cow's teats for

automatic milking Automatic milking is the milking of dairy animals, especially of dairy cattle, without human labour. Automatic milking systems (AMS), also called voluntary milking systems (VMS), were developed in the late 20th century. They have been commerciall ...

Arts and media

Music

* Tone cluster, a musical chord comprising at least three consecutive tones in a scale * ''Cluster'' (album), the 1971 eponymous album by the band Cluster *

Cluster (band) Cluster were a German musical duo consisting of Hans-Joachim Roedelius and Dieter Moebius, formed in 1971 and associated with West Germany's krautrock and kosmische music scenes.Bush, John. Allmusic: Cluster Retrieved 24 February 2005. Born f ...

, a German electronic group * "Cluster", a track from the album '' Ben Bu Sarkiyi Sana Yazdim'' by Cem Adrian * "Cluster", a song by P-Model from the album '' Big Body'' *

Cluster One "Cluster One", an instrumental, is the opening track on Pink Floyd's 1994 in music, 1994 album, ''The Division Bell''. History It is the first Pink Floyd song credited to just Richard Wright (musician), Wright/David Gilmour, Gilmour since "Mudmen ...

, the first track on Pink Floyd's 1994 album ''The Division Bell'' * "Cluster", an extended play by the pop-punk band

Waterparks A water park (or waterpark, water world) is an amusement park that features water play areas such as swimming pools, water slides, splash pads, water playgrounds, and lazy rivers, as well as areas for floating, bathing, swimming, and other bare ...

Other media

* ''Cluster'' (novels) by Piers Anthony * ''Cluster'', a poetry collection by

Souvankham Thammavongsa Souvankham Thammavongsa is a Laotian Canadian poet and short story writer. In 2019, she won an O. Henry Award for her short story, "Slingshot", which was published in ''Harper's Magazine'', and in 2020 her short story collection '' How to Prono ...

* The Cluster, a character from the TV series ''Steven Universe''

Urban development

* Business cluster, a geographic cluster of competitive businesses * Research-intensive cluster, a region with a high density of research-oriented organizations * Cluster home, a type of housing development

Other uses

* Cluster, Pleasants County, West Virginia *

Cluster diagram A Cluster diagram or ''clustering diagram'' is a general type of diagram, which represents some kind of cluster. A cluster in general is a group or bunch of several discrete items that are close to each other. The cluster diagram figures a cluste ...

, general type of diagram, which represents some kind of cluster * Clusterfuck or cluster, slang term for a messy situation, arising in the US Marine Corps * Clusters School of Digital Arts, an animation and visual effects training school