DocumentationMathematicaThe Mathematica BookMathematica Reference GuideListing of Named Characters
Prefix operator with built-in evaluation rules.
x is by default interpreted as Sqrt[x].
@, 2 or \@ yields a complete SqrtBox object.
\[Sqrt] is equivalent when evaluated, but will not draw a line on top of the quantity whose square root is being taken.
See Section 3.10.4.