Thin space

In typography, a thin space is a space character that is usually ⁄₅ or ⁄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.

In Unicode, thin space is encoded at U+2009THIN SPACE (HTML   · ). Unicode's U+202FNARROW NO-BREAK SPACE (HTML  ) is a non-breaking space with a width similar to that of the thin space.