This is documentation for Mathematica 4, which was
based on an earlier version of the Wolfram Language.
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TrueNull

False

FilledSmallSquareFalse is the symbol for the Boolean value false.

FilledSmallSquare See The Mathematica Book: Section 1.5.5.

FilledSmallSquare See also: TrueQ, True, Booleans.

Further Examples

TrueNull