I believe my professor called this variant price, but I am not certain. Is there a standard term?
It is known as the
range or the
price spread of the stock. You can read more about it here http://www.investopedia.com/terms/r/range.asp
Just guessing here… How about Daily Median price?
StockCharts provides a similar value they call VWAP. Which stands for Volume-Weighted Average Price. I believe it is a better 'average' for the day (click on link).