A cun (Chinese: 寸), often glossed as the Chinese inch, 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 four fingers (except the thumb) side-by-side is 3 cuns. It continues to be used to chart acupuncture points on the human body, and, in various uses for traditional Chinese medicine. In Japan, the corresponding unit, sun (寸), was standardized at 1000⁄33 mm (~3.030 cm, ~1.193 in, or ~0.09942 ft).