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SkeletonIndicator \[SkeletonIndicator]

FilledSmallSquare Uninterpretable element.

FilledSmallSquare name is used on output to indicate an expression that has head name, but whose arguments will not explicitly be given.

FilledSmallSquare \[SkeletonIndicator] indicates the presence of missing information, and so by default generates an error if you try to interpret it.

FilledSmallSquare See The Mathematica Book: Section 3.10.5.

FilledSmallSquare See also: \[LeftSkeleton] , \[Ellipsis] .