Complex commonly refers to: *

Complexity Complexity characterizes the behavior of a system or model whose components interact in multiple ways and follow local rules, leading to non-linearity, randomness, collective dynamics, hierarchy, and emergence. The term is generally used to c ...

, the behaviour of a system whose components interact in multiple ways so possible interactions are difficult to describe **

Complex system A complex system is a system composed of many components that may interact with one another. Examples of complex systems are Earth's global climate, organisms, the human brain, infrastructure such as power grid, transportation or communication sy ...

, a system composed of many components which may interact with each other *

Complex (psychology) A complex is a structure in the unconscious that is objectified as an underlying theme—like a power or a status—by grouping clusters of emotions, memories, perceptions and wishes in response to a threat to the stability of the self. I ...

, a core pattern of emotions etc. in the personal unconscious organized around a common theme such as power or status Complex may also refer to:

Arts, entertainment and media

* Complex (English band), formed in 1968, and their 1971 album ''Complex'' * Complex (band), a Japanese rock band * ''Complex'' (album), by Montaigne, 2019, and its title track * ''Complex'' (EP), by Rifle Sport, 1985 * "Complex" (song), by Gary Numan, 1979 * "Complex", a song by Katie Gregson-MacLeod, 2022 * "Complex" a song by

Be'O Yoo Chan-wook (; born April 27, 2000), known professionally as Be'O (; stylized in all caps), is a South Korean rapper and songwriter. He first garnered attention when he appeared on the rap competition TV show ''Show Me the Money 10'' in 2021. ...

and Zico, 2022 *

Complex Networks Complex Networks is an American media and entertainment company for youth culture, based in New York City. It was founded as a bi-monthly magazine, ''Complex'', by fashion designer Marc Eckō. Complex Networks reports on popular and emerging ...

, publisher of the now-only-online magazine ''Complex''

Biology

Protein–ligand complex A protein–ligand complex is a complex of a protein bound with a ligand (biochemistry), ligand that is formed following molecular recognition between proteins that interact with each other or with other molecules. Formation of a protein-ligand co ...

, a complex of a protein bound with a ligand *

Exosome complex The exosome complex (or PM/Scl complex, often just called the exosome) is a multi-protein intracellular complex capable of degrading various types of RNA (ribonucleic acid) molecules. Exosome complexes are found in both eukaryotic cells and ar ...

, a multi-protein intracellular complex *

Protein complex A protein complex or multiprotein complex is a group of two or more associated polypeptide chains. Protein complexes are distinct from multidomain enzymes, in which multiple active site, catalytic domains are found in a single polypeptide chain. ...

, a group of two or more associated polypeptide chains *

Species complex In biology, a species complex is a group of closely related organisms that are so similar in appearance and other features that the boundaries between them are often unclear. The taxa in the complex may be able to hybridize readily with each oth ...

, a cluster of very similar species difficult to delimit * Pre-Bötzinger complex, a cluster of interneurons in the ventral respiratory group of the medulla of the brainstem

Chemistry

Coordination complex A coordination complex is a chemical compound consisting of a central atom or ion, which is usually metallic and is called the ''coordination centre'', and a surrounding array of chemical bond, bound molecules or ions, that are in turn known as ' ...

, a central atom or ion and a surrounding array of bound molecules or ions * Chelate complex, a coordination complex with more than one bond

Mathematics

Complex number In mathematics, a complex number is an element of a number system that extends the real numbers with a specific element denoted , called the imaginary unit and satisfying the equation i^= -1; every complex number can be expressed in the for ...

, an extension of real numbers obtained by adjoining imaginary numbers * Complex, an element of a

field of sets In mathematics, a field of sets is a mathematical structure consisting of a pair ( X, \mathcal ) consisting of a set X and a family \mathcal of subsets of X called an algebra over X that contains the empty set as an element, and is closed under t ...

Chain complex In mathematics, a chain complex is an algebraic structure that consists of a sequence of abelian groups (or modules) and a sequence of homomorphisms between consecutive groups such that the image of each homomorphism is contained in the kernel o ...

, an algebraic structure *

Simplicial complex In mathematics, a simplicial complex is a structured Set (mathematics), set composed of Point (geometry), points, line segments, triangles, and their ''n''-dimensional counterparts, called Simplex, simplices, such that all the faces and intersec ...

, a kind of topological space *

CW complex In mathematics, and specifically in topology, a CW complex (also cellular complex or cell complex) is a topological space that is built by gluing together topological balls (so-called ''cells'') of different dimensions in specific ways. It generali ...

, a kind of topological space *

Line complex In algebraic geometry Algebraic geometry is a branch of mathematics which uses abstract algebraic techniques, mainly from commutative algebra, to solve geometry, geometrical problems. Classically, it studies zero of a function, zeros of multiv ...

, a 3-dimensional family of lines in space

Geology

Complex (geology) In geology Geology (). is a branch of natural science concerned with the Earth and other astronomical objects, the rocks of which they are composed, and the processes by which they change over time. Modern geology significantly overlaps all o ...

, a unit of rocks composed of rocks of two or three types *

Complex crater Complex craters are a type of large impact crater morphology. Complex craters are classified into two groups: ''central-peak craters'' and '' peak-ring craters''. Peak-ring craters have diameters that are larger in than central-peak craters and ...

, a type of large impact crater morphology *

Volcanic complex A complex volcano, also called a compound volcano or a volcanic complex, is a mixed landform consisting of related volcanic centers and their associated lava flows and pyroclastic rock. They may form due to changes in eruptive habit or ...

, a group of volcanoes *

Complex volcano A complex volcano, also called a compound volcano or a volcanic complex, is a mixed landform consisting of related volcanic centers and their associated lava flows and pyroclastic rock. They may form due to changes in eruptive habit or ...

, a volcano of mixed form *

Accretionary complex An accretionary wedge or accretionary prism forms from sediments Accretion (geology), accreted onto the non-Subduction, subducting tectonic plate at a Convergent boundary, convergent plate boundary. Most of the material in the accretionary wedge ...

, a fossil accretionary wedge

Other uses

* Building complex, a group of inter-related

buildings A building or edifice is an enclosed structure with a roof, walls and windows, usually standing permanently in one place, such as a house or factory. Buildings come in a variety of sizes, shapes, and functions, and have been adapted throughout ...

Housing complex A housing estate (or sometimes housing complex, housing development, subdivision or community) is a group of homes and other buildings built together as a single development. The exact form may vary from country to country. Popular throug ...