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Sqrt \[Sqrt]

FilledSmallSquare Alias: AliasIndicatorsqrtAliasIndicator.

FilledSmallSquare Prefix operator with built-in evaluation rules.

FilledSmallSquare x is by default interpreted as Sqrt[x].

FilledSmallSquareControlKeyLeftModified@RightModified, ControlKeyLeftModified2RightModified or \@ yields a complete SqrtBox object.

FilledSmallSquare \[Sqrt] is equivalent when evaluated, but will not draw a line on top of the quantity whose square root is being taken.

FilledSmallSquare See The Mathematica Book: Section 3.10.4.