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

Cog, COG, or CoG may also refer to:

Entertainment and media[edit]




Science and engineering[edit]

Other uses[edit]

  • Cog (ship), a type of sailboat from the 10th century onward
  • Cog (software), an open source audio player for Mac OS X
  • Cog (project), a project at the Humanoid Robotics Group of the Massachusetts Institute of Technology
  • Continuity of government, defined procedures that allow a government to continue its essential operations in case of catastrophe
  • Rear sprocket of a bicycle
  • Changing of the Guard (or Guard Mounting), a formal ceremony in which sentries are relieved by their replacements
  • Course over ground, the actual path followed by a vessel from A to B as determined by its course

See also[edit]