\[InvisibleSpace] is by default not visible on display, but is interpreted on input as an ordinary space.
\[InvisibleSpace] can be used as an invisible separator between variables that are being multiplied together, as in .
See The Mathematica Book: Section 2.8.11, Section 3.10.5 and Section 3.10.5.
See also: \[AlignmentMarker] , \[Null] , \[VeryThinSpace] , \[RawSpace] .
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