A wedge is a price pattern marked by converging trend lines on a price chart. The two trend lines are drawn to connect the respective highs and lows of a price series over the course of 10 to 50 periods. The lines show that the highs and the lows are either rising or falling at differing rates, giving the appearance of a wedge as the lines approach a convergence. Wedge shaped trend lines are considered useful indicators of a potential reversal in price action by technical analysts.