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FilledSmallSquareCellOpen is an option for Cell which specifies whether the contents of a cell should be explicitly displayed.

FilledSmallSquare With CellOpen->False, a small cell bracket is still shown to indicate the presence of a cell.

FilledSmallSquare Cells which are not open can still be evaluated automatically if you set InitializationCell->True.

FilledSmallSquare See The Mathematica Book: Section 2.10.9.

FilledSmallSquare See also: Visible, CellGroupData, ConversionRules.