Cog

Look up cog in Wiktionary, the free dictionary.

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

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

In fiction

The 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

"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
The Changing of the Guard (album), the twelfth album by indie rock band Starflyer 59
"Changing of the Guards", a single from Bob Dylan's 1978 album Street-Legal

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

Science and engineering

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

Military

Corporal of the Guard

Other

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

Cog