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FilledSmallSquare$NumberMarks gives the default value for the option NumberMarks, which specifies whether ` marks should be included in the input form representations of approximate numbers.

FilledSmallSquare The default setting for $NumberMarks is Automatic.

FilledSmallSquare$NumberMarks = True indicates that ` should by default be used in all approximate numbers, both machine-precision and arbitrary-precision ones.

FilledSmallSquare$NumberMarks = Automatic indicates that ` should by default be used in arbitrary-precision but not machine-precision numbers.

FilledSmallSquare$NumberMarks = False indicates that ` should by default never be used in outputting numbers.

FilledSmallSquare See The Mathematica Book: Section 3.1.4.

FilledSmallSquare See also: NumberForm, SetPrecision.