Gann High Low is a moving average based trend indicator consisting of two different simple moving averages. The Gann High Low Activator Indicator was described by Robert Krausz in a 1998 issue of Stocks & Commodities Magazine. It is a simple moving average SMA of the previous n period's highs or lows. The indicator tracks both curves (of the highs and the lows). The close of the bar defines which of the two gets plotted.