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An underline, also called an underscore,〔The American Heritage Dictionary of the English Language〕 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 typewritten documents as a way to emphasise key text. In printed documents underlining is generally avoided, with 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 special type such as italics, part of a procedure known as markup. Underlines are sometimes used as a diacritic, 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 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 *dots under letters to indicate text to be ignored. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「underline」の詳細全文を読む スポンサード リンク
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