Duplication, duplicate, and duplicator may refer to:

Biology and genetics

Gene duplication Gene duplication (or chromosomal duplication or gene amplification) is a major mechanism through which new genetic material is generated during molecular evolution. It can be defined as any duplication of a region of DNA that contains a gene ...

, a process which can result in free mutation * Chromosomal duplication, which can cause Bloom and Rett syndrome *

Polyploidy Polyploidy is a condition in which the cells of an organism have more than one pair of (homologous) chromosomes. Most species whose cells have nuclei (eukaryotes) are diploid, meaning they have two sets of chromosomes, where each set contains ...

, a phenomenon also known as ''ancient genome duplication'' * Enteric duplication cysts, certain portions of the gastrointestinal tract *

Diprosopus Diprosopus ( el, διπρόσωπος, "two-faced", from , , "two" and , euter "face", "person"; with Latin ending), also known as craniofacial duplication (cranio- from Greek , "skull", the other parts Latin), is an extremely rare congenital di ...

, a form of cojoined twins also known as ''craniofacial duplication'' * Diphallia, a medical condition also known as ''penile duplication''

Computing

Duplicate code In computer programming, duplicate code is a sequence of source code that occurs more than once, either within a program or across different programs owned or maintained by the same entity. Duplicate code is generally considered undesirable for a nu ...

, a source code sequence that occurs more than once in a program *

Duplicate characters in Unicode Unicode has a certain amount of duplication of characters. These are pairs of single Unicode code points that are canonically equivalent. The reason for this are compatibility issues with legacy systems. Unless two characters are canonically equi ...

, pairs of single Unicode code points that are canonically equivalent. The reason for this are compatibility issues with legacy systems * Data redundancy, either wanted or unwanted (in which case one resorts to

data deduplication In computing, data deduplication is a technique for eliminating duplicate copies of repeating data. Successful implementation of the technique can improve storage utilization, which may in turn lower capital expenditure by reducing the overall amou ...

) * Content copying through

cut, copy, and paste In human–computer interaction and user interface design, cut, copy, and paste are related commands that offer an interprocess communication technique for transferring data through a computer's user interface. The ''cut'' command removes t ...

File copying In digital file management, copying is a file operation that creates a new file which has the same content as an existing file. Computer operating systems include file copying methods to users, with operating systems with graphical user interface ...

Mathematics

* Duplication matrix, a linear transformation dealing with half-vectorization *

Doubling the cube Doubling the cube, also known as the Delian problem, is an ancient geometric problem. Given the edge of a cube, the problem requires the construction of the edge of a second cube whose volume is double that of the first. As with the related pro ...

, a problem in geometry also known as ''duplication of the cube'' * A type of

multiplication theorem Multiplication (often denoted by the cross symbol , by the mid-line dot operator , by juxtaposition, or, on computers, by an asterisk ) is one of the four elementary mathematical operations of arithmetic, with the other ones being addit ...

called the ''Legendre duplication formula'' or simply "duplication formula"

Technology

Duplicating machines Duplicating machines were the predecessors of modern document-reproduction technology. They have now been replaced by digital duplicators, scanners, laser printers and photocopiers, but for many years they were the primary means of reproducing d ...

, machines and processes designed to reproduce printed material, photocopying being among the best-known today; see also

List of duplicating processes This is a partial list of text and image duplicating processes used in business and government from the Industrial Revolution forward. Some are mechanical and some are chemical. There is naturally some overlap with printing processes and photogra ...

* Loop bin duplicator, a device designed to copy pre-recorded audio tapes *

Double track A double-track railway usually involves running one track in each direction, compared to a single-track railway where trains in both directions share the same track. Overview In the earliest days of railways in the United Kingdom, most lin ...

, a method of railway design also known as ''track duplication'' * In

road construction A road is a linear way for the conveyance of traffic that mostly has an improved surface for use by vehicles (motorized and non-motorized) and pedestrians. Unlike streets, the main function of roads is transportation. There are many types of ...

, conversion of a single carriageway into Dual carriageway

Art and fiction

* ''Duplicate'' (1998 film), a Bollywood film directed by Mahesh Bhatt * ''Duplicate'' (2009 film), a 2009 Malayalam film *''Duplicates'', a 1992 television film starring

Gregory Harrison Gregory Neale Harrison (born May 31, 1950) is an American actor. He is known for his roles as Chandler in the 1987 film ''North Shore'', as Dr. George Alonzo "Gonzo" Gates, the young surgeon assistant of Dr. Trapper John McIntyre (played by Per ...

and

Kim Greist Kimberley Bret Greist (born May 12, 1958) is a retired American actress and model, best known for her roles in films throughout the 1980s and 1990s. Biography Greist was born in Stamford, Connecticut, the daughter of Norma M. (née Abtey) and Ed ...

* ''

The Duplicate ''The Duplicate'', published in 1988, is a science fiction novel for young adults written by William Sleator. Plot summary The main character, David, finds a device at the beach that can duplicate any living organism. After testing the dev ...

'', a 1988 children's book by William Sleater * Batman Duplicate, a villain in ''Batman: The Animated Series'' * "

The Duplicate Man "The Duplicate Man" is an episode of the original ''The Outer Limits'' television show. It was first aired on 19 December 1964, during the second season. Opening narration :''Since the first day that Man stared up at the stars and saw other wor ...

", a 1964 episode of ''The Outer Limits'' * The duplicator machine in ''Calvin and Hobbes'' * "Duplicate", a song by White Town from '' Peek & Poke'' * "Duplicates", a song by We Are the Physics from ''

We Are the Physics Are OK at Music ''We Are the Physics Are OK at Music'' is the debut full-length album of We Are the Physics, released via This Is Fake DIY Records on 5 May 2008. The album is to have special "3D artwork": the cd case will fold out into a stage scene, and band m ...

Other uses

* Duplicate publication, the publication same intellectual material by the same author twice * Reduplication, a morphological process in linguistics *

Duplicate bridge Duplicate bridge is a variation of contract bridge where the same set of bridge deals (i.e. the distribution of the 52 cards among the four hands) are played by different competitors, and scoring is based on relative performance. In this way, eve ...

, a popular variant of contract bridge * Duplicate Scrabble, a Scrabble variant popular in French and some other languages * "Decouple, duplicate, discriminate," the "three Ds" articulated by

Madeleine Albright Madeleine Jana Korbel Albright (born Marie Jana Korbelová; May 15, 1937 – March 23, 2022) was an American diplomat and political scientist who served as the 64th United States secretary of state from 1997 to 2001. A member of the Democratic ...

as necessary for NATO to avoid * Duplicate, another term for

Body double In filmmaking, a double is a person who substitutes FOR another actor such that the person's face is not shown. There are various terms associated with a double based on the specific body part or ability they serve as a double for, such as stunt ...