Low price, in trading, is the lowest price at which a security or contract changed hands during a stated period, such as a five-minute bar, a trading session, a month or the past 52 weeks. Together with the opening price, the high price and the closing price, it makes up the open, high, low and close record used for price bars and candlestick charts, where it is the bottom of the lower wick.
Like the high, the low comes from executed trades and can be set by one small transaction, including an erroneous one that is later cancelled. Chart readers treat a previous low as a possible support level, and a common place for a stop-loss order is just beneath a recent low. The gap between the low and the high is the period's range, the input to range-based measures such as the Parkinson volatility estimator.