It is important to know that all the dimensions and all creatures that inhabit those dimensions were created through permutations of the holy names. The supernal root of all these names is the יהוה. This distinct name is often refered to as Hashem (The Name), Shem Hameforash (The Special Name), and Shem Hakadosh (The Holy Name), and represent the eternity of God. The four letters that make up יהוה correspond to the four directions, four seasons, four archangels, and four upper worlds, known as Atzilut (Emanation), Beriah (Creation), Yetzirah (Formation), and Assiyah (Action).