Overline

An overline or overbar or overscore (coined in analogy to underline and underscore, attested for mathematical notation since 1899), refers to the typographical feature of a line drawn immediately above the text, for example used to indicate medieval sigla. Specifically, a line drawn over one symbol is a macron, and a line over a collection of symbols is a vinculum. Marking one or more words with a continuous line above the characters is also described as "overstriking".