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The underscore (_ ) (also called ''understrike'', ''underbar'', or ''underline'') is a character that originally appeared on the typewriter and was primarily used to underline words. To produce an underlined word, the word was typed, the typewriter carriage was moved back to the beginning of the word, and the word was overtyped with the underscore character. This character is sometimes used to create visual spacing within a sequence of characters, where a whitespace character is not permitted, e.g., in computer filenames, email addresses, and in Internet URLs. Some computer applications will automatically underline text surrounded by underscores: _underlined_ will render underlined. It is often used in plain text-only media (IRC, instant messaging, classical Email) for this purpose. When the underscore is used for emphasis in this fashion, it is usually interpreted as indicating that the enclosed text is underlined or ''italicized'' (as opposed to bold, which is indicated by *asterisks *). The underscore is not the same character as the dash character, although one convention for text news wires is to use an underscore when an em-dash or en-dash is desired, or when other non-standard characters such as bullets would be appropriate. A series of underscores (_________ ) may be used to create a blank to be filled in on a form, although the resulting blank may have tiny gaps between each individual underscore. It is also sometimes used to create a horizontal line; other symbols with similar graphemes, such as hyphens and dashes, are also used for this purpose. ==Unicode encoding and typing== In Unicode, the character is encoded at . The ASCII value of this character is 95. On the standard US or UK 101/102 computer keyboard it shares a key with the hyphen-minus (-) on the top row, to the right of the 0 key. A similar Unicode character is , which is an underscore with two horizontal lines instead of one. 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「underscore」の詳細全文を読む スポンサード リンク
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