The backslash ( ) is a typographical mark (glyph) used chiefly in computing. It was first introduced in 1960 by Bob Bemer. Mini-Biography of Bob Bemer Sometimes called a reverse solidus, it is the mirror image of the common slash. It is also known as a slosh.Macquarie Dictionary (3rd edition) In colloquial speech, it is sometimes called a whack (however that term is considered to be properly a synonym only for the for