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Natural

Natural \[Natural]

FilledSmallSquare Letter-like form.

FilledSmallSquare Used to denote musical notes.

FilledSmallSquare Sometimes used in mathematical notation, often as an inverse of numbering operations represented by \[Sharp].

FilledSmallSquare See The Mathematica Book: Section 1.10.8 and Section 3.10.3.

FilledSmallSquare See also: \[Flat] , \[Sharp] .

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