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FilledSmallSquareReadProtected is an attribute which prevents values associated with a symbol from being seen.

FilledSmallSquare Individual values associated with read-protected symbols can be used during evaluation.

FilledSmallSquareDefinition[f], ?f, and related functions give only the attributes for read-protected symbols f.

FilledSmallSquare See The Mathematica Book: Section 2.5.3.

FilledSmallSquare See also: Locked, Protected, Copyable.