The backslash \ is a typographical mark used mainly in computing and is the mirror image of the common slash /.
Efforts to identify either the origin of this character or its purpose before the 1960s have not been successful. The earliest known reference found to date is a 1937 maintenance manual from the Teletype Corporation with a photograph showing the keyboard of its Wheatstone perforator. The purpose of the key remains to be discovered since the symbol did not have a Morse code encoding and thus would not have been transmitted.
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