The Unicode character U+2009 represents the "Thin Space", a whitespace character designed to create a space narrower than a standard space (U+0020) but wider than some other space characters like the Punctuation Space or Figure Space.
You can copy Thin Space here and use it wherever you like
Unicode | U+2009 |
---|---|
HTML Entity |   or   |
LateX | \thinspace |
CSS | \u2009 |