Backslash

[Kai]

A mark of punctuation ( \ ) introduced in 1960 as a deliberate way to convert two ALGOL symbols (up and down carets) into ASCII by using the new backslash and its traditional [opposite number], the [virgule] or slant ( /
/ - or - /\ for example.
The backslash went on to find use in early UNIX programs and today is party of a typical QWERTY keyboard, usually to the right of the bracket (and braces) keys. Other terms for the mark include [slosh], reverse virgule, and reverse slash.
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[Couch Potatoe]

A backward-sloping diagonal line (), used in some computer commands.

[Kit]

the symbol \ used for separating words or numbers in the names of computer files