http://en.wikipedia.org/wiki/Whitespace_%28computer_science%29
In computer science, white space is any character or series of whitespace characters that represent horizontal or vertical space in typography. When rendered, a whitespace character does not correspond to a visible mark, but typically does occupy an area on a page. For example, the common whitespace symbol U+0020 space (HTML: & #32; ), also ASCII 32, represents a blank space, used as a word divider in Western scripts.
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