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FilledSmallSquareComplex is the head used for complex numbers.

FilledSmallSquare You can enter a complex number in the form x + I y.

FilledSmallSquare_Complex can be used to stand for a complex number in a pattern.

FilledSmallSquare You have to use Re and Im to extract parts of Complex numbers.

FilledSmallSquare See The Mathematica Book: Section 3.1.1.

FilledSmallSquare See also: Complexes, Real, Re, Im.

Further Examples