underline

　 　

WordNet

1. draw a line or lines underneath to call attention to (同)underscore

PrepTutorEJDIC

1. 〈語句〉‘に'『下線を引く』 / …‘を'強調する / (強調または斜体字を示す)下線,アンダーライン

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/06/20 15:49:25」(JST)

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Underlined text.

An underline, also called an underscore, is a more or less horizontal line immediately below a portion of writing. Single and occasionally double (“double-underscore”) underlining was originally used in hand-written or typewritten documents to emphasise text. In a manuscript to be typeset, various forms of underlining were conventionally used to indicate that text should be set in a special typeface such as italics to show emphasis, part of a procedure known as markup. With the advent of word processing, different typefaces can be used in the manuscript directly so that underlining is no longer needed for markup, but underlining is sometimes used in documents in its own right.

Underlines are sometimes used as a diacritic, to indicate that a letter has a different pronunciation from its non-underlined form.

Use with computers

In web browsers, default settings typically distinguish hyperlinks by underlining them (and usually changing their color), but both users and websites can change these settings to make some or all hyperlinks appear differently (or even without distinction from normal text).

HTML and CSS

The HTML special inline element <ins>, denoting inserted text, is often presented as underlined text. HTML also has a presentational element <u>, denoting underlined text; this is deprecated in favour of the CSS style {text-decoration: underline}. These elements may also exist in other markup languages, such as MediaWiki; the Text Encoding Initiative (TEI) provides an extensive selection of related elements for marking editorial activity (insertion, deletion, correction, addition, etc.).

On Wikis

To underline text on a MediaWiki-server (e.g. Wikipedia) page, CSS can be used, and it is also possible to simply enclose with its HTML-tags: <u> to open and then </u> to cease underlining.

Unicode

Unicode has the combining diacritic “combining low line” at U+0332 ◌̲ that results in an underline when run together: u̲n̲d̲e̲r̲l̲i̲n̲e̲. Not to be confused is the combining macron below.

• single underline: a̲b̲c̲d̲e̲f̲g̲h̲i̲j̲k̲l̲m̲n̲o̲p̲q̲r̲s̲t̲u̲v̲w̲x̲y̲z̲0̲1̲2̲3̲4̲5̲6̲7̲8̲9̲
• double underline: a̲̲b̲̲c̲̲d̲̲e̲̲f̲̲g̲̲h̲̲i̲̲j̲̲k̲̲l̲̲m̲̲n̲̲o̲̲p̲̲q̲̲r̲̲s̲̲t̲̲u̲̲v̲̲w̲̲x̲̲y̲̲z̲̲0̲̲1̲̲2̲̲3̲̲4̲̲5̲̲6̲̲7̲̲8̲̲9̲̲

“Simulated” underlines in plaintext

In plain-text (ASCII) computer files, including plain-text e-mails, where underlining is not possible, it is often indicated by surrounding words with underscore characters. For example, “You must use an _emulsion_ paint on the ceiling”.

As a marker for incorrectness

Underline (typically red or wavy or both) is often used by spell checkers (and grammar checkers) to denote misspelled or otherwise incorrect text.

Underlines in non-Latin scripts

In Chinese, the underline is a punctuation mark for proper names (simplified Chinese: 专名号; traditional Chinese: 專名號; pinyin: zhuānmínghào; literally “proper name mark”, used for personal and geographic names). Its meaning is somewhat akin to capitalization in English and should never be used for emphasis; however, due to the influence of English computing, the underline is now sometimes used for emphasis. A wavy underline (simplified Chinese: 书名号; traditional Chinese: 書名號; pinyin: shūmínghào; literally “book title mark”) serves a similar function, but marks names of literary works instead of proper names.

In the case of two or more adjacent proper names, each individual proper name is separately underlined, so there should be a slight gap between the underlining of each proper name.

Manuscripts

The following kinds of underlines are used on manuscripts to indicate special typefaces to be used.

• single underline for italic type
• double underline for small caps
• triple underline for full capital letters (used among small caps or to change text already typed as lower case)
• wavy underline for boldface

See also

• Underscore (the _ character and similar, and other meanings)
• Overline
• Strikethrough

Notes

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