This is a three day bullish reversal pattern consisting of three candlesticks - a long-bodied black candle extending the current downtrend, a short middle candle that gapped down on the open, and a long-bodied white candle that gapped up on the open and closed above the midpoint of the body of the first day.
The opposite of this pattern is the "evening star"... this indicates bearishness and is reliable when formed after a strong uptrend.