Duplication

• 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, or doubling, multiplication by 2 • 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 ==