Shaft

A shaft is either:

• a hole in the earth typically used for mineral extraction, such as mining. They will normally be vertical, man-made structures. (See also pitch (underground space)).
• a long cylindrical piece of metal, typically found in motors, machines etc.
• the long cylindrical section of an architectural column between the base and the capital.

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Shaft is a 1971 film and a 2000 remake. See Shaft (1971 movie) and Shaft (2000 movie).