The Radical Sign Font The The Radical Sign font is used to write a radical sign equation. Here is how to use this font: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9: their respective numbers a: square root symbol b: short combining overline (as opposed to underline) c: long combining overline d: straight square root symbol e: extension for straight square root symbol f: corner for straight square root symbol g: cube root symbol h: straight cube root symbol i: 4th root symbol j: straight 4th root symbol So for the square root of 3, you would type this: ab3