A Piercing Pattern is a combination where the body of a green candle starts below the body of a red candle. The green candle follows the red one, while the closing price of the green candle is in the area of the upper part of the red candle body.
As a rule, this pattern gives a signal about the beginning of an uptrend. A Piercing Pattern works similarly to Bullish Engulfing, but it is not as strong. To confirm the signal, analyze other patterns as well.