What is chinese inch?

The term "Chinese inch" refers to a unit of measurement that is equivalent to 3.33 centimeters, or approximately 1.31 inches. It is not an official unit of measurement recognized by the International System of Units (SI), but is sometimes still used in certain regions of China for measuring cloth, garments and other small items. The Chinese inch is also known as the "fen chi" or "cun" in Chinese. Historically, the Chinese inch had varying lengths and even varied between different regions of China, but the standardized length of 3.33 centimeters was established in the late 19th century.