This is documentation for Mathematica 4, which was
based on an earlier version of the Wolfram Language.
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$Pre$PrePrint

$Post

FilledSmallSquare$Post is a global variable whose value, if set, is applied to every output expression.

FilledSmallSquare See The Mathematica Book: Section 2.13.1.

FilledSmallSquare See also: $Pre, $PrePrint.

$Pre$PrePrint