Backslash
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The backslash \ is a mark used mainly in computing and mathematics. It is the mirror image of the common slash /. It is a relatively recent mark, first documented in the 1930s. Wikipedia
In Unicode: U+005C \ REVERSE SOLIDUS (\)
See also: U+29F5 ⧵ REVERSE SOLIDUS OPERATOR; U+29F9 ⧹ BIG REVERSE SOLIDUS; U+FF3C ＼ FULLWIDTH REVERSE SOLIDUS