The bullish counterpart of three black crows is known as "three white soldiers" and is considered by some candle theorists as one of the most bullish candle patterns.
The three white soldiers pattern is most potent when it occurs after an extended decline and a period of subsequent consolidation. When a particular stock posts a decline followed by a sideways movement, the appearance at that point of three white soldiers signals that higher prices are likely ahead.
This 3-candle pattern is the opposite of “Three White Soldiers;” it signals the reversal away from bullish control at the top of an uptrend. It consists of three successive bearish bars that open within the preceding bar’s body and close below its close.