Cog

• A cog is a tooth of a gear or cogwheel or the gear itself.
• Rear sprocket of a bicycle.
• Cog (ship), a type of sailboat from the 10th century onward.

Cog, COG, or CoG may also refer to:

Science and engineering

• Center of gravity, a spatial point related to an object's center of mass
• Cluster of Orthologous Groups of proteins; see Sequence homology and MicrobesOnline
• 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

Entertainment and media

• C.O.G., 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

Fiction

• Coalition of Ordered Governments, a fictional organization from the Gears of War series
• Cogs, the fictional antagonists in the MMORPG Toontown Online
• Cogs, the fictional foot soldiers of Power Rangers' Machine Empire

Music

• Cog (band), an Australian progressive rock band
• "Changing of the Guards", 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
• "Changing of the Guard", a song from Exodus' 1990 album Impact Is Imminent

Organizations

• Canberra Ornithologists Group, an Australian ornithological organization
• Children's Oncology Group, a National Cancer Institute supported clinical trials group
• Church of God (disambiguation), a name used by numerous, mostly unrelated Christian denominational bodies
• Council of governments, regional bodies that exist throughout the United States
• Covenant of the Goddess, a cross-traditional Wiccan group
• The ISO 3166-1 alpha-3 country code for Republic of the Congo

Other uses

• 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
• 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

• Change of gauge (disambiguation), with various senses in the airline and rail industries
• C0G, an EIA Class 1 dielectric material with the lowest capacitance/temperature dependence
• CoG (disambiguation)
• COGS (disambiguation)
• Coq, in computer science, Coq is an interactive theorem prover
• Kog (disambiguation)