A wedge chart pattern is a chart formation resembling a wedge formed by a narrowing price range over time, either ascending or descending. In a wedge pattern two trend lines are moving in the same direction but narrowing in width. Eventually a breakthrough occurs to end the pattern.

An ascending wedge features price highs which decrease incrementally while price lows increase incrementally. Ascending wedges typically conclude with a downside breakout, making them a bearish indicator
A descending wedge features price declines which become incrementally smaller, concluding with an upside breakout, making the descending wedge pattern a bullish indicator