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FilledSmallSquarePrefix[f[expr]] prints with f[expr] given in default prefix form: f @ expr.

FilledSmallSquarePrefix[f[expr], h] prints as hexpr.

FilledSmallSquarePrefix[expr, h, precedence, grouping] can be used to specify how the output form should be parenthesized.

FilledSmallSquare See the notes for Infix about precedence and grouping.

FilledSmallSquare See The Mathematica Book: Section 2.8.16.

FilledSmallSquare See also: Infix, Postfix.

Further Examples