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The foot (pl. feet; abbreviation: ft; symbol: ′, the prime symbol) is a unit of length in the imperial and US customary systems of measurement. Since 1959, both units have been defined by international agreement as equivalent to 0.3048 meters exactly. In both systems, the foot comprises 12 inches and three feet compose a yard.
The mickey is a unit used to describe the distance of movement of a computer mouse (presumably getting its name from Mickey Mouse). There are a number of slightly different definitions for this unit.