HoldForm[expr] prints as the expression expr, with expr maintained in an unevaluated form.
HoldForm allows you to see the output form of an expression without evaluating the expression.
HoldForm has attribute HoldAll.
HoldForm is removed by ReleaseHold.
See The Mathematica Book: Section 2.5.5 and Section 2.8.6.
See also: ToString, WriteString.