One of the few things I debate in my trading on a regular basis is the criteria used to define a reaction H/L. After myriad discussions with many traders, there seems to be a mixed consensus. I am interested in how people here on ET define a reaction H/L. For the sake of this thread, we will consider an uptrending market. Do you consider the bar with the lowest low preceding a break of the highest high to be a reaction low? or Do two bars with equal lows preceding a break of the highest high constitute a reaction low? or Do both of the aforementioned situations constitute a reaction low? Any thoughts are appreciated.