SkeletonIndicator
 Usage
 \[SkeletonIndicator]
Notes
• Uninterpretable element. •  name  is used on output to indicate an expression that has head name, but whose arguments will not explicitly be given. • \[SkeletonIndicator] indicates the presence of missing information, and so by default generates an error if you try to interpret it. • See Section 3.10.5. • See also: \[LeftSkeleton] , \[Ellipsis] .
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