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overline
An overline, overscore, or overbar, is a typographical feature of a horizontal line drawn immediately above the text. In mathematical notation, an overline has been used for a long time as a ''vinculum'', a way of showing that certain symbols belong together. Other uses are to indicate Roman numerals multiplied by a thousand and in forming 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.
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. Since ISO and Unicode Consortium assign names to characters in their unique fashion and often ignore the established typographical terminology, Unicode includes two characters (formerly ) and that ''both'' look like an overlined space in most fonts, similar to a mirrored underscore symbol. An overline proper can be encoded as a Unicode diacritic; see below.
==Uses==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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