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FilledSmallSquareDeletable is an option for Cell which specifies whether the cell can be deleted interactively using the front end.

FilledSmallSquare With the setting Deletable->False at the notebook level, you can prevent any cells in any notebook from being deleted.

FilledSmallSquare See The Mathematica Book: Section 2.8.10 and Section 2.10.9.

FilledSmallSquare See also: Editable, Selectable.