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MagnificationShowSelection

ShowCellBracket

FilledSmallSquareShowCellBracket is an option for Cell which specifies whether to display the bracket that indicates the extent of the cell.

FilledSmallSquareShowCellBracket is often set for styles of cells or whole notebooks instead of individual cells.

FilledSmallSquare See The Mathematica Book: Section 2.10.9.

FilledSmallSquare See also: CellFrame, ShowSelection.

MagnificationShowSelection