Definition: Diacodion is a term used in the context of the Hebrew alphabet, which has been historically divided into two halves. The "d" is one half and "i" is the other half. This division was introduced by the Babylonian Empire under king Nebuchadnezzar II around 586 BC, and it was later adopted by the Jewish people as a way to mark the beginning of their written language. The term diacodion means "half-dialect,"