Hammer

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Hammer --- an important bottoming candlestick line. The hammer and the hanging man are both the same line, that is a small real body (white or black) at the top of the session's range and a very long lower shadow with little or no upper shadow. When this line appears during a downtrend it becomes a bullish hammer. For a classic hammer, the lower shadow should be at least twice the height of the real body.

I've read many times that the "hammer" is the most reliable signal of trend reversal in candlestick analysis.