Overline
Horizontal line immediately above a portion of writing / From Wikipedia, the free encyclopedia
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An overline, overscore, or overbar, is a typographical feature of a horizontal line drawn immediately above the text. In old mathematical notation, an overline was called a vinculum, a notation for grouping symbols which is expressed in modern notation by parentheses, though it persists for symbols under a radical sign. The original use in Ancient Greek was to indicate compositions of Greek letters as Greek numerals.[1] In Latin, it indicates Roman numerals multiplied by a thousand and it forms medieval abbreviations (sigla). Marking one or more words with a continuous line above the characters is sometimes called overstriking, though overstriking generally refers to printing one character on top of an already-printed character.
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Description | Sample | Unicode | CSS/HTML |
---|---|---|---|
Overline (markup) |
Xx | — | text-decoration: overline; |
Overline (character) |
‾ | U+203E | ‾ , ‾ |
X̅x̅ (combining) | U+0305 | X̅ | |
Double overline (markup) |
Xx | — | text-decoration: overline; |
Double overline (character) |
X̿x̿ (combining) | U+033F | X̿ |
Macron (character) |
¯ | U+00AF | ¯ , ¯ |
X̄x̄ (combining) | U+0304 | X̄ | |
X̄x̄ (precomposed) | varies |
An overline, that is, a single line above a chunk of text, should not be confused with the macron, a diacritical mark placed above (or sometimes below) individual letters. The macron is narrower than the character box.[2]