Complex commonly refers to: * Complexity, the behaviour of a system whose components interact in multiple ways so possible interactions are difficult to describe ** Complex system, 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. In p ...

, 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) Complex were an English band formed in 1968 consisting of lead guitarist Brian Lee, lead vocalist and drummer Tony Shakespeare, bass guitarist Lance Fogg and rhythm guitarist Tony Fisher. After some initial personnel changes, in early 1970 the l ...

, formed in 1968, and their 1971 album ''Complex'' *

Complex (band) Complex was a Japanese rock duo composed of guitarist Tomoyasu Hotei and singer Koji Kikkawa. They released their self-titled debut in 1989, along with their first single and video, "Be My Baby". After a tour to promote the album, they released i ...

, 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 Networks, publisher of magazine ''Complex'', now online

Biology

Protein–ligand complex A protein–ligand complex is a complex of a protein bound with a ligand that is formed following molecular recognition between proteins that interact with each other or with various other molecules. Formation of a protein-ligand complex is based ...

, 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 Protein complex, complex capable of degrading various types of RNA (ribonucleic acid) molecules. Exosome complexes are found in both eukaryo ...

, 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 multienzyme complexes, in which multiple catalytic domains are found in a single polypeptide chain. Protein ...

, 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 The preBötzinger complex, sometimes written pre-Bötzinger complex (preBötC), is a functionally and anatomically specialized site in the ventral-lateral region of the lower medulla oblongata (i.e., lower brainstem). The preBötC is part of the v ...

, a cluster of interneurons in the ventral respiratory group of the medulla of the brainstem

Chemistry

* Coordination complex, 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, an extension of real numbers obtained by adjoining imaginary numbers * Complex polytope, a generalization of a polytope in a complex Hilbert space * Complex analysis, the study of functions of complex numbers * Complex, an element of a field of sets * Chain complex, an algebraic structure * Simplicial complex, a kind of topological space ** CW complex, a kind of topological space * Line complex, a 3-dimensional family of lines in space

Geology

* Complex (geology), a unit of rocks composed of rocks of two or three types * Complex crater, a type of large impact crater morphology * Volcanic complex, a group of volcanoes * Complex volcano, a volcano of mixed form * Accretionary complex, a fossil accretionary wedge

Other uses