The low, or lowest price, is one of four major data points used in stock market day trading. The other three are known as the opening price, high, and close, and all four are referred to collectively as OHLC. The low is generally defined as the lowest price obtained in the previous 24-hour trading period since the markets opened. In contrast to the traditional stock market, which is closed for trading on weekends, cryptocurrency markets are open 24 hours a day, every day of the year.