From Traderpedia

This candle pattern only appears at high price levels, or in the context of an uptrend that is becoming exhausted. The pattern consists of three solid (black) candles that close at, or near their lows.

The first candle will appear near the top of an uptrend that is already starting to show signs of running out of steam. Long upper shadows may have appeared on previous clear (white) candles.

The second and third candles of this formation should ideally open within the length of the body of the previous session and should close at or near the lows of that session.

It is a useful candlestick formation to predict a potential reversal and as the pattern concludes, it should be obvious to most traders that the market has fallen significantly downwards from the recent high level.