(עתיק יומין Atik Yomin, from Aramaic) A name for God in many traditions.
"I beheld till the thrones were cast down, and the Ancient of days did sit, whose garment [was] white as snow, and the hair of his head like the pure wool: his throne [was like] the fiery flame, [and] his wheels [as] burning fire." - Daniel 7:9
"The First Mystery is [the sephirah] Kether, the Ancient of Days..." - Samael Aun Weor, The Gnostic Bible: The Pistis Sophia Unveiled
"...the ineffable Ancient of Days who is the Being of our Being, the Father/Mother within us." - Samael Aun Weor, Tarot and Kabbalah
"The tree [of life] begins with the Ancient of Days, Kether, who is in the most elevated place of the tree." - Samael Aun Weor, Tarot and Kabbalah