Tetragrammaton

The Tetragrammaton, literally means the four letter word. The word in question is the Hebrew word (יהוה) spelled using the Hebrew alphabet : yodh י heh ה waw ו heh ה. This is the ineffable name of God in Hebrew, and is so holy that observant Jewish people read it as "hashem" which means "the name". A reading from the Tanakh when Moses was faced with the burning bush on [Mount Sinai]?, translates the Tetragrammaton as I am that I am. Because of the strictures in Judaism, the pronunciation is controversial. See Yahweh and The name of God in Judaism.