It is a single candle with a small body(either white/green or black/red) and a long lower tail just like the image below.
It is usually found at the top of a uptrend and it signals the reversal of the uptrend. In effect it has a opposite effect of a hammer. Hanging man usually signals the point where the uptrend starts to go down. The continuous uptrend prompts buyers to buy while price is low while sellers keeps on demanding higher price.
When the hanging man candle appears it means that those who bought are now left out hanging because the trend now is reverse. The stock is now overbought and everyone wants to get rid of their holdings thus they are force to sell lower.
A chart pattern made of two candles of which a white/green candle with a small body is followed by a taller black/red candle making it look like the black/red candle will engulf the small candle.
Such pattern indicates the change in trend after uptrend.
A Dark Cloud Cover is a pattern where a tall white/green candle is followed by a black/red candle which has a higher open and a closing price not below the previous closing price.
Bearish Piercing Pattern
A Bearish Piercing Pattern is made when a black/red tall candle is followed by a small white/green candle that is below midway the black candle’s body. If the white/green candle’s body is above midway of the black/red’s body the pattern indicates a Bullish Piercing Pattern.
Such pattern is a continuation of a downtrend. When the white/green candlestick’s body is above midway of the black/red candle, it could indicate of a reversal of the downtrend.