Jisho

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(単位)
Wikipedia definition
1. Nail (unit)A nail, as a unit of cloth measurement, is generally a sixteenth of a yard or 2 inches (5.715 cm). The nail was apparently named after the practice of hammering brass nails into the counter at shops where cloth was sold. On the other hand, R D Connor, in The weights and measures of England (p 84) states that the nail was the 16th part of a Roman foot, i.e. , digitus or finger, although he provides no reference to support this.
Read “Nail (unit)” on English Wikipedia
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Read “Nail (unit)” on DBpedia

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