What Is a Radical Sign?

What Is a Radical Sign?. Part of the series: Math Problems & History. A radical sign, which looks like a check mark with a roof, is used to indicate what number multiplied by itself a certain number of times will give the final answer. Calculate the square root or cubed root of a number with a radical sign using help from a math teacher in this free video math lesson. Read more: http://www.ehow.com/video_4754358_wha...