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.