A cog is a tooth of a gear or cogwheel or the gear itself. Cog, COG, CoG, or The Cog may also refer to:

Science and engineering

* Rear

sprocket A sprocket, sprocket-wheel or chainwheel is a profiled wheel with teeth that mesh with a chain, track or other perforated or indented material. The name 'sprocket' applies generally to any wheel upon which radial projections engage a chain passi ...

of a bicycle *

Cog (ship) A cog is a type of ship that first appeared in the 10th century, and was widely used from around the 12th century on. Cogs were clinker-built, generally of oak. These vessels were fitted with a single mast and a square-rigged single sail. The ...

, a type of sailboat from the 10th century onward * Center of gravity, a spatial point related to an object's

center of mass In physics, the center of mass of a distribution of mass in space (sometimes referred to as the balance point) is the unique point where the weighted relative position of the distributed mass sums to zero. This is the point to which a force may ...

* Cluster of Orthologous Groups of proteins; see

Sequence homology Sequence homology is the biological homology between DNA, RNA, or protein sequences, defined in terms of shared ancestry in the evolutionary history of life. Two segments of DNA can have shared ancestry because of three phenomena: either a spe ...

and

MicrobesOnline MicrobesOnline is a publicly and freely accessible website that hosts multiple comparative genomic tools for comparing microbial species at the genomic, transcriptomic and functional levels. MicrobesOnline was developed by the Virtual Institute fo ...

* Conserved oligomeric Golgi complex, that includes COG2, COG4, etc. *

INSEE code The INSEE code is a numerical indexing code used by the French National Institute for Statistics and Economic Studies (INSEE) to identify various entities, including communes and ''départements''. They are also used as national identification ...

(also ''code officiel géographique''), a numerical indexing code used by the French National Institute for Statistics and Economic Studies *

Mount Washington Cog Railway The Mount Washington Cog Railway, also known as the Cog, is the world's first mountain-climbing Rack railway, cog railway (rack-and-pinion railway). The railway climbs Mount Washington in New Hampshire, United States. It uses a Rack railway#Mars ...

, the world's first mountain-climbing cog railway *

OpenCog OpenCog is a project that aims to build an open source software, open source artificial intelligence framework. OpenCog Prime is an architecture for robot and virtual embodied cognition that defines a set of interacting components designed to giv ...

, a project that aims to build an open source artificial general intelligence framework

Entertainment and media

* ''

C.O.G. ''C.O.G.'' is an American comedy-drama film directed and written by Kyle Patrick Alvarez and starring Jonathan Groff. The film is based on a David Sedaris short story from his book of collected essays, ''Naked (book), Naked''. It marks the first ...

'', a 2013 American drama * "The Changing of the Guard" (''The Twilight Zone''), a 1962 episode of the TV series ''The Twilight Zone'' * "Cog" (advertisement), a British television and cinema advertisement launched by Honda * '' Star Wars Jedi Quest 8: The Changing of the Guard'', the eighth book in the Star Wars ''Jedi Quest'' series by Jude Watson * ''COG'', a 2020 novel by

Greg van Eekhout Greg van Eekhout is a science fiction and fantasy writer. His "In the Late December" (2003) was nominated for the Nebula Award for Best Short Story, and his middle-grade fantasy novel ''The Boy at the End of the World'' was nominated for the 2012 ...

Fiction

* Coalition of Ordered Governments, a fictional organization from the ''Gears of War'' series * Cogs, the fictional antagonists in the MMORPG ''

Toontown Online ''Toontown Online'', commonly known as ''Toontown'', was a 2003 massively multiplayer online role-playing game based on a cartoon animal world, developed by Disney's Virtual Reality Studio and Schell Games, and published by The Walt Disney Comp ...

'' * Cogs, the fictional foot soldiers of ''Power Rangers''

Machine Empire ''Power Rangers Zeo'' is a television series and the fourth season of the ''Power Rangers'' franchise, based on the 19th Super Sentai series ''Chouriki Sentai Ohranger''. It is the continuation of ''Mighty Morphin Power Rangers'', which aired in ...

Music

Cog (band) Cog are an Australian progressive rock band that formed in 1998. Their debut album, '' The New Normal'', was nominated for Triple J's 2005 J Award. The band's music is influenced by Tool,

, an Australian progressive rock band * "

Changing of the Guards Guard mounting, changing the guard, or the changing of the guard, is a formal ceremony in which sentries performing ceremonial guard duties at important institutions are relieved by a new batch of sentries. The ceremonies are often elaborate an ...

", a single from Bob Dylan's 1978 album ''Street-Legal'' * ''The Changing of the Guard'' (album), 2010 album by indie rock band Starflyer 59 * "Change of the Guard", a song from Steely Dan's 1972 album ''

Can't Buy a Thrill ''Can't Buy a Thrill'' is the debut studio album by American rock band Steely Dan, released in November 1972 by ABC Records. The album was written by band members Donald Fagen and Walter Becker, recorded in August 1972 at the Village Recorder in ...

'' * "Changing of the Guard", a song from Exodus' 1990 album '' Impact Is Imminent''

Organizations

Canberra Ornithologists Group The Canberra Ornithologists Group (COG) was founded on 15 April 1970 when the ACT branch of the Royal Australasian Ornithologists Union The Royal Australasian Ornithologists Union (RAOU), now part of BirdLife Australia, was Australia's large ...

, an Australian ornithological organization *

Children's Oncology Group The Children's Oncology Group (COG), a clinical trials group supported by the National Cancer Institute (NCI), is the world's largest organization devoted exclusively to pediatric cancer research. The COG conducts a spectrum of clinical research a ...

, a National Cancer Institute supported clinical trials group *

Church of God (disambiguation) Church of God is a name used by numerous denominational bodies. The largest denomination with this name is the Church of God (Cleveland, Tennessee) Adventist Churches of God * Church of God General Conference (Church of God of the A ...

, a name used by numerous, mostly unrelated Christian denominational bodies *

Council of governments Councils of governments (CoGs—also known as regional councils, regional commissions, regional planning commissions, and planning districts) are regional governing and/or coordinating bodies that exist throughout the United States. CoGs are norma ...

, regional bodies that exist throughout the United States *

Covenant of the Goddess The Covenant of the Goddess (CoG) is a cross-traditional Wiccan group of solitary Wiccan practitioners and over one hundred affiliated covens (or congregations). It was founded in 1975 in order to increase co-operation among witches and to secur ...

, a cross-traditional Wiccan group * The ISO 3166-1 alpha-3 country code for

Republic of the Congo The Republic of the Congo (french: République du Congo, ln, Republíki ya Kongó), also known as Congo-Brazzaville, the Congo Republic or simply either Congo or the Congo, is a country located in the western coast of Central Africa to the w ...

Other uses

Cog (software) Cog is an open source audio player for macOS. The basic layout is a single-paned playlist interface with two retractable drawers, one for navigating the user's music folders and another for viewing audio file properties, like bitrate. Along with ...

, an open source audio player for Mac OS X *

Cog (project) Cog was a project at the Humanoid Robotics Group of the Massachusetts Institute of Technology. It was based on the hypothesis that human-level intelligence requires gaining experience from interacting with humans, like human infants do. This in tur ...

, a project at the Humanoid Robotics Group of the Massachusetts Institute of Technology *

Continuity of government Continuity of government (COG) is the principle of establishing defined procedures that allow a government to continue its essential operations in case of a catastrophic event such as nuclear war. COG was developed by the British government bef ...

, defined procedures that allow a government to continue its essential operations in case of catastrophe * Changing of the Guard (or

Guard Mounting Guard mounting, changing the guard, or the changing of the guard, is a formal ceremony in which sentries performing ceremonial guard duties at important institutions are relieved by a new batch of sentries. The ceremonies are often elaborate an ...