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K-line chart is also called candle chart, Japanese line, Yin-Yang line, bar line, etc. The commonly used term is "K-line", which originated from the Tokugawa shogunate era (1603-1867) in Japan in the 18th century. Rice market trading is used to calculate the daily rise and fall of rice prices. Because of its unique marking method, people have introduced it into the analysis of stock market price trends. After more than 300 years of development, it has been widely used in stocks, futures, foreign exchange, options and other securities markets. There are three types of K-line charts that are commonly used: K-lines that connect a single target price with a single line; candlestick K-line charts; and European and American K-line charts.