It is a three-day formation using candlestick charts.
It is significant only if it appears in an upward moving chart. The candlestick pattern spread across 3 days shows this trend. The day 1 long candlestick can show bull market then on day 2 a small candle appears with high values and low values not far away but higher than day 1. On day 3 , the pattern shows, higher value more than Day 2 but closing value less than day 2 which starts to show bearish trend.