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A cog is a tooth of a gear or cogwheel or the gear itself.

cog may also refer to:

Other uses[edit]

Cog, COG, or CoG may also refer to:

  • Cog (ship), a type of sailboat from the 10th century onward
  • Cog (software), an open source audio player for Mac OS X
  • Cog (band), an Australian progressive rock band
  • Cog (project), a project at the Humanoid Robotics Group of the Massachusetts Institute of Technology
  • Rear sprocket of a bicycle[1]


In fiction[edit]



Science and engineering[edit]

  • Center of gravity, a spatial point related to an object's center of mass
  • COG, Cluster of Orthologous Groups of proteins
  • Conserved oligomeric Golgi complex, that includes COG2, COG4 etc
  • INSEE code (also code officiel géographique), a numerical indexing code used by the French National Institute for Statistics and Economic Studies
  • Mount Washington Cog Railway, the world's first mountain-climbing cog railway
  • OpenCog, a project that aims to build an open source artificial general intelligence framework
  • Chip on glass, where an integrated circuit is mounted directly to a piece of glass - typically an LCD


  • Changing of the Guard (or Guard Mounting), a formal ceremony in which sentries are relieved by their replacements
  • Continuity of government, the principle of establishing defined procedures that allow a government to continue its essential operations in case of catastrophe
  • Course over ground, the actual path followed by a vessel from A to B as determined by its course
  • Choice of Games, text-based, multiple-choice games.
  • Change of gauge (disambiguation), with various senses in the airline and rail industries
  • Customer Owned Goods, a term used in the linen industry to distinguish between rental and non-rental items
  • Cost of Goods, a term used in retail systems to define portion of budget spent for materials
  • Chief of Government, a term used to refer to the executive of a country

See also[edit]

  1. ^ Sheldon Brown (Nov 29, 2011). "Cog". Retrieved 2018-08-19. Cog - Popular term for a rear sprocket.