A graphical representation of a stock's movement that usually contains the open, high, low and closing prices for a set period of time.

For example, if a technical trader is working with daily data, one bar is the set of quotes for one day. In the case of one-minute data, it is the price data for one minute. Also, if the data is displayed using a candlestick chart, one bar equals one candlestick or in the case of bar charts, one bar is equal to one bar.