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FilledSmallSquareHoldComplete[expr] shields expr completely from the standard Mathematica evaluation process, preventing even upvalues associated with expr from being used.

FilledSmallSquareHoldComplete has attribute HoldAllComplete, and performs no operations on its arguments.

FilledSmallSquareHoldComplete is removed by ReleaseHold.

FilledSmallSquareHoldComplete can be inserted as a wrapper by such functions as ToExpression and ReplacePart.

FilledSmallSquareHoldComplete is generated by default by MakeExpression.

FilledSmallSquare See The Mathematica Book: Section 2.5.5 and Section A.4.4.

FilledSmallSquare See also: Hold, HoldPattern, HoldForm, Unevaluated, HoldAllComplete, Symbol.