A thin space is a blank typographic unit equal to one-fifth (sometimes one-sixth) of an em wide. Not to be confused with a narrow no-break space. The narrow no-break space is often used as an unambiguous thousands separator. It is also used to add space to nested quotation marks.
In Unicode, thin space is encoded at U+2009 thin space (HTML
). Unicode's U+202F narrow no-break space is a non-breaking space with a width similar to that of the thin space. In HTML, a narrow non breaking space may be written as
In LaTeX and Plain TeX, \thinspace results in a narrow no-break space. \, works the same way outside math formulas with LaTeX, while inside math formulas it works like a breakable narrow space. In Plain TeX,
\, throws in error outside math formulas and, as in LaTeX, produces a breakable narrow space inside math formulas.
In Microsoft Word and other word processors, within the symbol dialog (often available via Insert > Symbol or Insert > Special Characters), both the thin space and the narrow no-break space are available for point-and-click insertion. In Word's Symbol dialog, under font = "(normal text)", they are found in subset = "General Punctuation".
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- For Plain TeX, see D. E. Knuth: The TeXbook, Addison Wesley, Reading, Massachusetts, 1984 and later, p. 5 as well as p. 352. The reason is that both in Plain TeX and in LaTeX,
\thinspaceis defined as a
\kern, at which a line cannot be broken, see The TeXbook, p. 75, and J. Braams and others: The LaTeX 2ε Sources (PDF, 2.3MB), 2011/06/27, p. 65.
\,essentially is defined as
\ifmmode\mskip\thinmuskip\else\thinspace\fi, so it results in an
\mskipwhich produces glue, The TeXbook p. 290 and chapter 12.
- The TeXbook, p. 357.
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