SelectionPlaceholder
 Usage
 \[SelectionPlaceholder]
Notes
• Alias:  spl. • Letter-like form. • Used to indicate where the current selection should be inserted when the contents of a button are pasted by NotebookApply. • Not the same as \[FilledSquare] . • See Section 1.10.12, Section 2.11.3 and Section 3.10.5. • See also: \[Placeholder] .
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