The Three White Soldiers formation is a bullish pattern that is useful for predicting the reversal of a bearish trend. This pattern consists of 3 consecutive long white or green “soldiers” that have all closed higher than the previous day, with each session’s open (the botton of the bar) occurring within the trunk of the previous candle.
Three White Soldiers are a good indication and confirmation of a switch in market sentiment and are frequently used by traders to confirm a reversal after a substantial downtrend.
You could see 3 White soldiers after the market has been moving sideways for a while, but the strongest indication of a reversal is if they occur right after a prolonged bearish trend.
This pattern is basically the opposite of Three Black Crows.