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\[DotlessI]\[DottedSquare]

DotlessJ

DotlessJ \[DotlessJ]

FilledSmallSquare Letter.

FilledSmallSquare Used when a j will have an overscript on top.

FilledSmallSquare May or may not match the ordinary j from the text font.

FilledSmallSquare See The Mathematica Book: Section 3.10.3.

FilledSmallSquare See also: \[DotlessI] .

\[DotlessI]\[DottedSquare]