DocumentationMathematicaBuilt-in FunctionsSystem InterfaceGlobal Parameters
$PrePrint
$PrePrint is a global variable whose value, if set, is applied to every expression before it is printed.
$PrePrint is applied after Out[n] is assigned, but before the output result is printed. See Section 2.14.1. See also: $Post, $MessagePrePrint. New in Version 1.
Further Examples
$PrePrint is a global variable whose value, if set, is applied to every expression before it is printed. 
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