A radical is a symbol which is not labeled on most keyboards, So I will just tell you what it looks like. A radical is a check mark looking symbol, which is used to represent a square root of a number. A radical is mostly used in math but I guess it could be used in other things, but I can't think of anything else that it would be used for because there are easier ways to show some one a square root of a number without the wierd check mark.
EXAMPLES OF RADICALS
check mark, then a 5
3 squared, check mark, then a 7
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