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[[Image:Underlined.SVG|thumb|200px|right|Underlined text.]] |
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An '''underline''', also called an [[underscore]],<ref>[[The American Heritage Dictionary of the English Language]]</ref> is a more or less horizontal line immediately below a portion of [[writing]]. Single and occasionally double ("double-underscore") underlining is used in hand-written or [[typewriter|typewritten]] [[document]]s as a way to [[emphasis (typography)|emphasise]] key text. |
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In printed documents underlining is generally avoided, with [[italic type|italics]] or [[small caps]] often used instead, or (especially in headings) using [[capitalization]] or [[bold type]]. In a [[manuscript]] to be [[typeset]], various forms of underlining were therefore conventionally used to indicate that text should be set in [[italic type|italics]], part of a procedure known as [[markup language#History|markup]]. |
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Underlines are sometimes used as a [[diacritic]], to indicate that a letter has a different pronunciation from its non-underlined form. |
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==Use with computers== |
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In [[web browser]]s, default settings typically distinguish [[hyperlink]]s 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). |
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===HTML and CSS=== |
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The [[HTML element#Special inline elements|HTML special inline element]] <code><nowiki><ins></nowiki></code>, denoting inserted text, is often presented as underlined text. HTML also has a [[HTML element#Presentational markup|presentational element]] <code><nowiki><u></nowiki></code>, denoting underlined text; this is [[deprecated]] in favor of the [[CSS]] style <code>{text-decoration: underline}</code>. These elements may also exist in other [[markup language]]s, such as [[MediaWiki]]; the [[Text Encoding Initiative]] (TEI) provides an extensive selection of related elements for marking editorial activity (insertion, deletion, correction, addition, etc.). |
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=== On Wikis === |
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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: '''<nowiki><u></nowiki>''' to open and then '''<nowiki></u></nowiki>''' to cease underlining.<ref>Help:Wikitext examples. 2 Feb 2011. Wikimedia Metawiki. 10 Feb 2011 <http://meta.wikimedia.org/wiki/Help:Wikitext_examples#HTML_tags></ref> |
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===Unicode=== |
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[[Unicode]] has the [[combining diacritic]] "combining low line" at U+0332 {{unicode|◌̲}} that results in an underline when run together: {{unicode|u̲n̲d̲e̲r̲l̲i̲n̲e̲}}. Not to be confused is the [[combining macron below]]. |
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* ''single underline:'' a̲b̲c̲d̲e̲f̲g̲h̲i̲j̲k̲l̲m̲n̲o̲p̲q̲r̲s̲t̲u̲v̲w̲x̲y̲z̲0̲1̲2̲3̲4̲5̲6̲7̲8̲9̲ |
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* ''double underline:'' a̲̲b̲̲c̲̲d̲̲e̲̲f̲̲g̲̲h̲̲i̲̲j̲̲k̲̲l̲̲m̲̲n̲̲o̲̲p̲̲q̲̲r̲̲s̲̲t̲̲u̲̲v̲̲w̲̲x̲̲y̲̲z̲̲0̲̲1̲̲2̲̲3̲̲4̲̲5̲̲6̲̲7̲̲8̲̲9̲̲ |
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==="Simulated" underlines in plaintext=== |
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In [[plain-text]] ([[ASCII]]) computer files, including plain-text [[e-mail]]s, 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". |
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===As a marker for incorrectness=== |
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Underline (typically red or wavy or both) is often used by [[spell checker]]s (and [[grammar checker]]s) to denote misspelled or otherwise incorrect text. |
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==Underlines in non-Latin scripts== |
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In [[Chinese language|Chinese]], the underline is a punctuation mark for proper names ({{zh|t=專名號|s=专名号}}; [[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 ({{zh|t=書名號|s=书名号}}; [[pinyin]]: shūmínghào; literally "[[book title mark]]") serves a similar function, but marks names of literary works instead of proper names. |
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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. |
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==Manuscripts== |
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The following kinds of underlines are used on manuscripts to indicate special [[typeface]]s to be used. |
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*single underline for [[italic type]] |
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*double underline for [[small caps]] |
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*triple underline for full [[capital letters]] (used among small caps or to change text already typed as lower case) |
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*wavy underline for [[boldface]] |
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==See also== |
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{{Wiktionary|underline}} |
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*[[Underscore]] (the '''_''' character and similar, and other meanings) |
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*[[Overline]] |
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*[[Strikethrough]] |
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==Notes== |
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{{Reflist}} |
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[[Category:Typography]] |
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