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FilledSmallSquareUnevaluated[expr] represents the unevaluated form of expr when it appears as the argument to a function.

FilledSmallSquaref[Unevaluated[expr]] effectively works by temporarily setting attributes so that f holds its argument unevaluated, then evaluating f[expr].

FilledSmallSquare Example: Length[Unevaluated[5+6]] LongRightArrow.

FilledSmallSquare See The Mathematica Book: Section 2.5.5.

FilledSmallSquare See also: Hold, HoldFirst, ReplacePart.

Further Examples