A doji is a key trend reversal indicator. This is particularly true when there is a high trading volume following an extended move in either direction.[2] When a market has been in an uptrend and trades to a higher high than the previous three trading days, fails to hold that high, and closes in the lower 10% of that day's trading range, there is a high probability of a downtrend in the ensuing days. Likewise, when the market has been in a downtrend and trades to a new low that's lower than the three previous trading days, fails to hold that low, and closes in the upper 10% of that day's trading range, there is a high probability of an uptrend in the ensuing days.