Thin space

Space character about 1/5 em wide

In typography, a thin space is a space character whose width is usually 1⁄5 or 1⁄6 of an em. 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. It is also used in the International System of Units and in many countries as a thousands separator when writing numbers in groups of three digits, in order to facilitate reading. It also avoids the ambiguity of the comma, used as a thousands separator in many countries but as a decimal point in Europe.

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