NonBreakingSpace \[NonBreakingSpace]
Alias: nbs. Spacing character. Generates a space with the same width as \[RawSpace], but with no line break allowed to occur on either side of it. See The Mathematica Book: Section 2.8.11, Section 3.10.5. See also: \[NoBreak], \[InvisibleSpace], \[NewLine].
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