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The cun (; Japanese: ''sun''; Korean: ''chon'') is a traditional Chinese unit of length. Its traditional measure is the width of a person's thumb at the knuckle, whereas the width of the two forefingers denotes 1.5 cun and the width of all fingers side-by-side is three cuns. In this sense it continues to be used to chart acupuncture points on the human body in various uses of traditional Chinese medicine. The cun was part of a larger system, and represented one-tenth of a chi ("Chinese foot"). In time the lengths were standardized, although to different values in different jurisdictions. (See chi (unit) for details). In Hong Kong, using the traditional standard, it measures ~3.715 cm (~1.463 in) and is called a "tsun".〔Government of Hong Kong, (Weights and Measures Ordinance ) of 1997〕 In the twentieth century in the Republic of China, the lengths were standardized to fit with the metric system, and in current usage in People's Republic of China and Taiwan it measures cm (~1.312 in). In Japan, the corresponding unit, , was standardized at mm (~3.030 cm, ~1.193 in, or ~0.09942 ft). ==See also== * ''shaku'' 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cun (unit)」の詳細全文を読む スポンサード リンク
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