A substitute character (␚) is a control character that is used in the place of a character that is recognized to be invalid or in error or that cannot be represented on a given device. It is also used as an escape sequence for some programming languages. ==Uses== Under CP/M 1 and 2 (and derivatives like MP/M) it was necessary to explicitly mark ...
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http://en.wikipedia.org/wiki/Substitute_character
a control character used in place of a character which is recognized as invalid or in error, or which cannot be represented on the particular equipment in use
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=721-10-37
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