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Also known as U+005F, _, LOW LINE, spacing underscore, low line, underline, understrike, underbar

thumb|right|Underlining was developed for mechanical machines like this Underwood Typewriter Company|Underwood typewriter which had no bold or [[italic type. The only way to emphasize text that was typewritten was to back up the carriage and type underscores beneath the text. Underlining was a workaround for shortcomings in typewriter technology.]] thumb|right|Underscored or underlined text. An underscore or underline is a line drawn under a segment of text. In proofreading, underscoring is a convention that says "set this text in italic type", traditionally used on manuscript or typescript as