The Line of Zero Indicator is a useful and popular free Forex indicator for MT4 trading platforms. The Line of Zero Indicator works by plotting a line on the chart that is the average of the highs and lows of the past X number of periods. This line is then used to identify buying and selling opportunities, as when the price crosses above the line it indicates a buy signal, and when it crosses below the line it indicates a sell signal. With its easy to use interface and highly customizable settings, the Line of Zero Indicator is a great choice for any Forex trader.