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An underline, also called an ,The American Heritage Dictionary of the English Language is a more or less horizontal line immediately below a portion of . Single and occasionally double ("double-underscore") underlining is used in hand-written or as a way to emphasise key text.

In printed documents underlining is generally avoided, with or often used instead, or (especially in headings) using or . In a to be , various forms of underlining were therefore conventionally used to indicate that text should be set in special type such as , part of a procedure known as markup.

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


Manuscripts
The following kinds of underlines are used on manuscripts to indicate the special to be used:

  • single underline for
  • double underline for
  • triple underline for full (used among small caps or to change text already typed as lower case)
  • wavy underline for
  • dots under letters to indicate text to be ignored.


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


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


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 () computer files, including plain-text , if underlining is not possible, it is often indicated by surrounding words with 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 (and ) to denote misspelled or otherwise incorrect text.


Underlines in non-Latin scripts
In , the underline is a punctuation mark for proper names (; : 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 even if the influence of English computing makes the latter sometimes occur. A wavy underline (; : 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.


See also


Notes
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