I believe it is a Wide Range Bar. In
VSA, the S stands for Spread, which is high - low. Analyzing the spread of the bar is very significant depending on the volume and the location of the bar relative to previous S/R areas.
A
WRB usually means that the market makers were involved. That's why if you see high volume on a
WRB you should become vigilant of what happens next. If it is an upbar, it could mean that the market makers are unloading their positions and price will soon start to drop, you would need to look for weakness in the background and no demand bars, up-thrusts or top reversal to appear before shorting. However, it the
WRB pierced through a previous area of resistance, it could mean strength, you would want to look for a test or low volume narrow spread downbars before price resumes the upmove.
That is just one example of the role wide range bars play in
VSA.