The barleycorn is a historical unit of measurement that originated from the size of a grain of barley. It was used primarily in the UK and various other regions for measuring length. Specifically, one barleycorn is equivalent to approximately 1/3 of an inch or about 8.47 millimeters. In terms of application, the barleycorn was commonly used in the measurement of shoe sizes, where the size increments were based on the length of the foot in barleycorns.
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