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FilledSmallSquare$MinMachineNumber is the smallest positive machine-precision number that can be used on a particular computer system.

FilledSmallSquare See notes for $MaxMachineNumber.

FilledSmallSquare See The Mathematica Book: Section 3.1.6.

FilledSmallSquare See also: $MinNumber.

FilledSmallSquare Related package: NumericalMath`ComputerArithmetic`.