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FilledSmallSquareNonConstants is an option for D which gives a list of objects to be taken to depend implicitly on the differentiation variables.

FilledSmallSquare If c does not appear in the list of NonConstants, then D[c, x] is taken to be 0 unless c and x are identical expressions.

FilledSmallSquare See The Mathematica Book: Section 3.5.1.

FilledSmallSquare See also: Dt.

Further Examples