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

A cog engages with another cog and motion in one will result in motion of the other. Gearwheels that engage with chains are sprockets, not cogs.

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


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, Cluster of Orthologous Groups of proteins|Clusters of Orthologous Groups of proteins
  • 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]