The ultraradical symbol is a notation thet can be used to express solutions not obtainable by finite root extraction. The solution to the irreducible quintic equation
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is written 
.
Ultraradical
See also
RadicalExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Ultraradical." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Ultraradical.html