Crank
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- A person who holds strong, unorthodox opinions is sometimes called a crank.
- In mechanical engineering, a crank is a bent rod or the bent portion of an axle.
- The crankshaft of a piston engine is sometimes colloquially called a crank
- The crankset of a bicycle is sometimes colloquially called a crank
- Crank is slang for several recreational drugs, including amphetamines, and methamphetamine.
- In the United States in the late 19th Century, "cranks" were followers and enthusiasts of the game of baseball. This usage became archaic at the beginning of the 20th Century, when it was replaced by the word "fans".
- Crank! is a science fiction fanzine edited by Bryan Cholfin.
- crank! a record company is a record label that released albums by emo bands Mineral, The Gloria Record, and Bright Eyes
- In mathematics, a crank is a term coined by Freeman Dyson to explain congruence patterns in integer partitions.