This mantra is related to יהוה, the Tetragrammaton, which as we see is in the left side of העליון מעליון Helion Melion.
In Hebrew the word העליו Helion means “the highest,” and מעליון Melion means “upon the highest.” So when we say Helion Melion we are saying, “the highest upon the highest,” which is יהוה Yod-Hei-Vav-Hei, Yod-Havah, the Tetragrammaton.
Magic Circle
“When you trace around yourself a magic circle, whether it is with your sword, with your willpower and imagination united in vibrating harmony, or with both at the same time, you must pronounce the following mantras:
Helion Melion Tetragrammaton העליון מעליון יהוה
“The magician defends himself against attacks from the demons with the magic circle and the esoteric pentagram.” Samael Aun Weor