K-line chart has many other names, such as candle chart, daily line, yin-yang line and so on. The most common name is K-line, which was originally used to calculate the daily trend of rice price. Later, it can also be used in stock, futures, options and other securities markets.

A columnar line composed of shadow lines and entities is called K-line. The hatching part above the entity is called the upper hatching and the lower hatching. Entities are divided into positive and negative lines.