Keter ,the first of the ten sefirot, corresponds to the superconscious realm of experience--and thus accounting for the image of a "crown," which suggests an aura surrounding one's consciousness. In the configuration of the sefirot, keter appears at the top of the middle axis. The Zohar states: "the supernal crown [keter elyon] is the crown of kingdom [keter malchut]." The first, highest of the Divine emanations--keter--is thus linked to the last--malchut. The word keter = 620. This is the full number of God's commandments to Israel, the 613 mitzvot of the written Torah together with the 7mitzvot of the oral Torah. The Torah text of the Ten Commandments possesses 620 letters, for all of the 620 mitzvot are included in the Ten Commandments. In Kabbalah, the secret of the 620 commandments is that from keter (=620) are projected "620 pillars of light" which serve to connect the "ceiling" of keter to the "floor" of malchut. These pillars of light encompass the souls of Israel that devotedly fulfill the will (keter) of the King of Kings, the Holy One blessed be He (malchut). The sefirah of keter develops into two partzufim ("profiles"). Its outer partzuf, referred to as Arich Anpin ("the Elongated Face"), corresponds to the superconscious power of ratzon ("will") in the soul. Its inner partzuf, referred to as Atik Yomin ("the Ancient of Days"), corresponds to the corresponding power of ta'anug ("pleasure") in the soul. The seven lower sefirot of Atik Yomin "enclothe" themselves within the partzuf of Arich Anpin, (thus introducing pleasure as a primary motivational force driving the will). The three upper sefirot of Atik Yomin, which do not "enclothe" themselves within Arich Anpin, represent the unadulterated superconscious pleasure of emunah ("faith")--deriving from the experience of one's essential rootedness within Divinity. Hence, Kabbalah speaks of the three Reishin ("heads") of keter, referred to by the Zohar (Deuteronomy 288a ) and the Arizal as: Reisha d'Arich ("the elongated head"), corresponding to the force of ratzon; Reisha d'Ayin ("the head of nothingness"), corresponding to the force of ta'anug; and Reisha d'lo Ityada ("the unknowable head"), corresponding to the force of emunah. These three "heads" of keter correspond to the three meanings of the word keter in Hebrew. In addition to meaning "crown," the root keter means both "to wait" and "to surround." The meaning "to wait" corresponds to "the unknowable head" of keter, for we wait, in perfect faith, for that level of God's essential Divinity, absolutely hidden and concealed from the consciousness of this world, to become revealed in the consciousness of the world to come. The meaning "crown" corresponds, in particular, to "the head of nothingness," the source of Divine pleasure in the soul. The "crown" symbolizes the spiritual power to receive and integrate into one's consciousness the pleasure of Divine revelation, as our sages express with regard to the world to come: "the righteous sit with their crowns on their heads and receive pleasure from the radiance of the Divine Presence" (Tractate Kalah Rabati 2:3). The meaning "to surround" corresponds to "the elongated head," the level of supernal will. The power of will "surrounds" all of the conscious powers of the soul (corresponding to the Divine emanations from chochmah to malchut). It forces them to manifest themselves in accord with its directions. Taken from http://inner.org/sefirot/sefketer.htm

Keter means crown, it represents the motivating force that supersedes the Ten Sephirot (see http://www.answerbag.com/q_view/426254). In human terms it relates to motivation or intention.

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Keter is the last gate to enter as we ascend the Tree of Life. It is also the first gate for descending the Tree. Therefore, it is both the ending and the beginning. The Divine name for Keter is Ehyeh Asher Ehyeh, or "I am that I am ". It is everything-the past, present and future. The Archangel for Keter is Metatron who is considered the greatest of all angels and chief of the ministering angels, or Celestial Academy. He sits next to God on the Throne of Glory and is often refered to as the glory of God. The Patriarch who represents the "crown" or Keter is Adam Kadmon, the blueprint for all mankind. Some see the sefirah of Keter as being too high to be represented by anyone. But Adam is the epitome of what we can reach as humans because he represents total harmony where female and male energies are in perfect balance. In Keter consciousness we are alone. We live with humility and eqanimity. We are in a state of peace and we radiate Light, love, and joy. We are also filled with the passion and will to live our Divine purpose. At the Keter level of consciousness, Lurianic Kabbalists include two more aspects of the soul: chayah and yechidah. They consider the nefesh, ruach and neshamah levels as internal or within the body while these are transcendent or out of the body. Reaching Keter can also mean the ending of life here on earth. However we are not considered dead, either. We are in transition. It is the tohu v'vohu, the formlessness and void. Keter is connected to Binah and Chokmah. It stands for Onenes and Will. It begins the Tree of Life and stands alone as one of the ten demensions.