Names of God in Judaism
In Judaism, God is known by many names. The most important of these names is the Tetragrammaton, or "Four-lettered word": YHVH, YHWH, or י ה ו ה. Jews are not allowed to say this name, and instead say Adonai. Even Adonai is only used by some Jews in prayer. Most Jews would refer to God as Hashem, or "The Name". Jews are not allowed to erase the Tetragrammaton, so they rarely write it down outside of their most holy books, such as the Torah.