Thin space

In typography, a thin space is a space character that is usually  ¹⁄₅ or  ¹⁄₆ of an em in width. It is used to add a narrow space, such as between nested quotation marks or to separate glyphs that interfere with one another. It is not as narrow as the hair space.

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• References

In Unicode, thin space is encoded at U+2009   thin space (HTML   ·  ). Unicode's U+202F   narrow no-break space (HTML  ) is a non-breaking space with a width similar to that of the thin space.

In LaTeX and Plain TeX, hinspace produces a narrow, non-breaking space. Outside math formulas in LaTeX, , also produces a narrow, non-breaking space, but inside math formulas it produces a narrow, breakable space.

In some versions of Microsoft Word, the symbol dialog (often available via Insert > Symbol or Insert > Special Characters), has both the thin space and the narrow no-break space available for point-and-click insertion. In Word's Symbol dialog, under font = "(normal text)", they are found in subset = "General Punctuation", Unicode character 2009 and nearby. Other word processing programs have ways of producing a thin space.

Thin spaces are recommended for use as a thousands separator for measures made with SI units.