A traditional unit of length in China, sometimes called the Chinese inch. In modern China, the cun is equal to exactly 3-1/3 cm, or about 1.312 336 inches. There are 10 cun in the chî or Chinese foot. The cun is sometimes identified as the distance between the two outer folds in the bent middle finger, and this personal unit (called the "body inch" in English) is still used by traditional acupuncturists