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

Cog, COG, or CoG may also refer to:


In fiction[edit]



Science and engineering[edit]

  • C0G, an EIA Class 1 dielectric material with the lowest capacitance/temperature dependence
  • Center of gravity, a spatial point related to an object's center of mass
  • COG, Clusters of Orthologous Groups of proteins (COG Database)
  • Cog, an integral part of a gear
  • Cog (project), a project at the Humanoid Robotics Group of the Massachusetts Institute of Technology
  • 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


  • Call of Gods game by mochigames
  • Changing of the Guard (or Guard Mounting), a formal ceremony in which sentries are relieved by their replacements
  • Cog (ship), a type of sailboat from the 10th century onward
  • Cog (software), an open source audio player for Mac OS X
  • 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

See also[edit]