Қабала ағашындағы Кете́р – Бас Сфера

Topmost of the Sephirot of the Tree of Life in Kabbalah

Keter or Kether (, Keṯer, lit. "crown") is the topmost of the sefirot of the Tree of Life in Kabbalah. Since its meaning is "crown", it is interpreted as both the "topmost" of the Sefirot and the "regal crown" of the Sefirot. It is between Chokhmah and Binah (with Chokhmah on the right and Binah on the left) and it sits above Tiferet. It is usually given three paths, to Chokhmah, Tiferet and Binah. Keter is called in the Zohar "the most hidden of all hidden things". It is also described as absolute compassion, and Moses ben Jacob Cordovero describes it as the source of the 13 Supernal Attributes of Mercy.

Moses ben Jacob Cordovero, in The Palm Tree of Devorah, discusses ethical behaviour that man should follow, related to the qualities of the Sephirot, in order that man might emulate his Creator. Humility is the first, because although Keter is the highest, it is ashamed to look at its cause, and instead gazes at those below it. One's thoughts should be pure, one's forehead should display no harshness, one's ears should always turn to hear good, one's eyes should distance themselves from noticing evil, always looking at the good, one's nose should be free from the breath of anger, one's face should always shine, and his mouth should express nothing except good.

In The Mystical Qabalah Dion Fortune describes Keter as pure consciousness, beyond all categories, timeless, a point that crystallises out of the Ein Soph Aur (Limitless Light), and commences the process of emanation that ends in Malkuth. The name of God given to it is Eheieh, the archangel that presides over it is Metatron, the order of angels that resides in it are the Holy Living Creatures (the Chaioth ha Qadesh, Hebrew: חיות הקדש), and its mundane chakra is said to be the First Swirlings of the cosmos (Primum Mobile, Rashith ha Gilgalin). A. E. Waite made mention that Rabbi Azariel ben Menachem, a student of Isaac the Blind, in his Commentary on the Sephiroth granted a particular colour to each Sephira, yet these do not agree with the colours given in the Zohar, where Kether (which, according to him, is also correlated to Yechidah) is called colourless, Tiphareth purple, and Malkuth sapphire blue. As pure formless consciousness, it is often compared with the Sahasrara chakra, which resides above the crown of the head, in Indian Shakta Tantra. In Aleister Crowley's Liber 777, Keter is associated with the Four Aces of the Tarot deck, White Brilliance, Poseidon, Brahma, Wodan, Zeus, The Trinity, Almond in flower, Diamond, Elixir Vitae, Dao, and Death. Furthermore, Crowley associates the qlippothic demonic order of Thaumiel with Kether. Thaumiel in turn is associated with (or "ruled by") the demons Satan and Moloch. These same demons are also associated with Ghagiel and Sathariel, the upper triad. Keter is also identified with the planets Neptune or Pluto, the Atma in Theosophy and Raja Yoga, and the Khabs am Pekht in Egyptian mysticism.

In the SCP Foundation mythos and related media, "Keter" is one of the primary classifications for anomalous objects or entities. Specifically, the "Keter" classification denotes objects or entities that are exceedingly difficult to reliably contain.