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It means it is a different kind of root, such as a cubic root, which has a three above the square root symbol ('radical sign').

If y is the square root of x, it means that y2 = x. So the square root of 4 is 2, and 22 is 4.

If y is the cube root of x, it means that y3 = x. So the cube root of 8 is 2, and 23 = 8.

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