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FilledSmallSquareSign[x] gives -1, 0 or 1 depending on whether x is negative, zero, or positive.

FilledSmallSquare For non-zero complex numbers z, Sign[z] is defined as z/Abs[z].

FilledSmallSquareSign tries simple transformations in trying to determine the sign of symbolic expressions.

FilledSmallSquare For exact numeric quantities, Sign internally uses numerical approximations to establish its result. This process can be affected by the setting of the global variable $MaxExtraPrecision.

FilledSmallSquare See The Mathematica Book: Section 3.2.2.

FilledSmallSquare See also: Abs, UnitStep, Positive, Negative, NonNegative, Greater, Simplify, Assumptions.

Further Examples