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You've most likely encountered the High Priestess before, but in other forms - she can be seen in the archetypes of Persephone, Artemis, Isis and many more. When you encounter her, you will see her sitting on a cubic stone between the two pillars at Solomon’s Temple, Jachin, and Boaz. Jachin (right) is generally referred to as the Pillar of Establishment and Boaz (left) is the Pillar of Strength. The pillars also depict the duality of nature; masculine and feminine, good and evil, negative and positive. The High Priestess's location between the two suggests that it is her responsibility to serve as a mediator between the depths of the reality. She is the third pillar - the path between.