# Cluster

Cluster(s) may refer to:

## Science and technology
### Astronomy

* Cluster (spacecraft), constellation of four European Space Agency spacecraft
* Cluster II (spacecraft), a European Space Agency mission to study the magnetosphere
* Asteroid cluster, a small asteroid family
* Galaxy cluster, large gravitationally bound groups of galaxies, or groups of groups of galaxies
* Supercluster, 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, 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, a neurological disease that involves an immense degree of pain
* Cluster of differentiation, protocol used for the identification and investigation of cell surface molecules present on white blood cells
* Winter cluster, in beekeeping, a well-defined cluster of honey bees in cold temperatures
* Disease cluster, a grouping of cases of disease
* Gene cluster, 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

### Chemistry

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

### Computer science

* Computer cluster, a set of computers that work together
* Data cluster, a group of disk sectors used in a File Allocation Table

### Economics

* Business cluster, a geographic cluster of competitive businesses
* Cluster theory, a theory that states concentrating industries in specific regions creates several advantages

### Education

* CLUSTER, the Consortium Linking Universities of Science and Technology for Education and Research (a collection of twelve European universities which focus on science and engineering)

### Equipment

* Cluster bomb, a type of air-dropped or ground-launched shells
* Instrument cluster of an automobile
* A bicycle cogset, either a freewheel, or cassette
* The set of tubes attached to a cow's teats for automatic milking

### Linguistics

* Consonant cluster, a group of consonants which have no intervening vowel
* Language cluster or dialect cluster, a geographic distribution of languages

### Math and statistics

* Cluster analysis, 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
* Cluster graph, in graph theory, a disjoint union of complete graphs
* Clusterable graph, in balance theory
* Cluster algebra, a class of commutative rings used in representation theory
* Cluster expansion, a technique in statistical mechanics and quantum field theory

### Physics

* Cluster (physics), a small group of atoms or molecules

### Urban development

* Cluster home, a type of housing development
* Research-intensive cluster, a region with a high density of research-oriented organizations
* Urban agglomeration, a cluster concept in urban development (a human settlement with a high population density and an infrastructure of built environment)

## Philosophy and religion

* Khandha, a Buddhist concept of five material and mental factors that take part in the rise of craving and clinging
* Proper name (philosophy), a cluster of propositions that in combination pick out a unique referent

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

### Other media

* Cluster (novels) by Piers Anthony
* Cluster, a poetry collection by Souvankham Thammavongsa
* The Cluster, a character from the TV series Steven Universe

## Other uses

* Cluster, Pleasants County, West Virginia
* Cluster diagram, 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