Tetragrammaton

The Tetragrammaton is the word referring to the four-letter unspeakable name of the Creator. In Hebrew it is rendered יהוה , the English equivalent of YHVH. This is the origin of such English words as "Jehovah". Jews believe the name to be unspeakable until the arrival of Moshiach (the Messiah) and the restoration of the Temple in Jerusalem.