Hair Space

The Hair Space at U+200A is an extremely narrow invisible spacing character used to insert a tiny amount of horizontal separation in text. It is part of the General Punctuation block and is treated as whitespace, but it is much thinner than an ordinary word space. Its most legitimate use is fine typography: a compositor may place it around delicate punctuation, between close-fitting symbols, or in tightly set headings where a normal space looks too wide. It can help separate adjacent quotation marks, initials, mathematical operators, or units in carefully designed print and digital layouts. In everyday writing it is uncommon, because word processors and layout engines usually handle spacing with kerning, tracking, or style settings instead. The main practical gotcha is that it is invisible and easy to copy accidentally, which can make search, comparison, or cursor movement feel inconsistent when two strings appear identical but contain different spacing.