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Surd

Real-valued nth root.

$ wo 'Surd[8, 3]'
2

$ wo 'Surd[27, 3]'
3

$ wo 'Surd[16, 4]'
2

$ wo 'Surd[-8, 3]'
-2

$ wo 'Surd[x, 3]'
Surd[x, 3]

\[CubeRoot] is the prefix operator for the real-valued cube root, so it is negative for a negative argument:

$ wo '\[CubeRoot](-8)'
-2

$ wo 'Head[\[CubeRoot]y]'
Surd