K-line, the so-called candle chart. From Sanshi, Japan. Later, it was applied to the pricing system of related financial products such as stocks. K line is divided into positive line and negative line. The positive line means that the starting price is lower than the ending price. Yinxian is the opposite. The upper and lower ends of a cylindrical entity indicate the starting or ending price. The lines at the upper and lower ends of the cylindrical entity represent the highest and lowest prices of the manager from beginning to end.