Duplication, duplicate, and duplicator may refer to: Biology and genetics Gene duplication, a process which can result in free mutation Chromosomal duplication, which can cause Bloom and Rett syndrome Polyploidy, a phenomenon also known as ancient genome duplication Enteric duplication cysts, certain portions of the gastrointestinal tract Diprosopus, a form of cojoined twins also known as craniofacial duplication Diphallia, a medical condition also known as penile duplication Computing Duplicate code, a source code sequence that occurs more than once in a program Duplicate characters in Unicode, 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) Content copying through cut, copy, and paste File copying Mathematics Duplication matrix, a linear transformation dealing with half-vectorization Doubling the cube, a problem in geometry also known as duplication of the cube A type of multiplication theorem called the Legendre duplication formula or simply "duplication formula" Technology Duplicating machines, machines and processes designed to reproduce printed material, photocopying being among the best-known today; see also List of duplicating processes Loop bin duplicator, a device designed to copy pre-recorded audio tapes Double track, a method of railway design also known as track duplication In road construction, 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 and Kim Greist The Duplicate, a 1988 children's book by William Sleater Batman Duplicate, a villain in Batman: The Animated Series "The Duplicate Man", 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 Other uses Duplicate publication, the publication same intellectual material by the same author twice Reduplication, a morphological process in linguistics Duplicate bridge, 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 as necessary for NATO to avoid Duplicate, another term for Body double in films See also Clone, the process of producing similar populations of genetically identical individuals that occurs in nature when organisms such