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underscore __

解釋 __ 在 .... 下劃線

Underscore.

The underscore [ _ ], called LOW LINE in various computer standards, is a character that originally appeared on the typewriter. Prior to the advent of word processing, the underscore character was the only method of underlining words. To produce an underlined word, the word was typed, the typewriter carriage was then 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 white space character is not permitted, e.g., in computer filenames, e-mail addresses, and in World Wide Web URLs. Some computer applications will automatically underline text surrounded by underscores: _underlined_ will render underlined. It is also conventionally used in this fashion on Usenet to indicate emphasis, and can be used in other ASCII-only media (E-mail, IRC, Instant Messaging) 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 italicised (as opposed to bold, which is indicated by *asterisks*).

The underscore is different character from 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 (like _________) may be used to create a blank to be filled in on a form. It is also sometimes used to create a horizontal line, if no other method is available.