Within the depth-psychology corpus, Six emerges as a numerological symbol of unusual density, drawing together traditions as disparate as Pythagorean mathematics, Tarot hermeneutics, I Ching line-commentary, and Tibetan Buddhist cosmology. The most theoretically developed treatments appear in Hamaker-Zondag and Nichols, both working in a Jungian frame: Nichols identifies Six as the ‘first perfect number’ after Pythagoras — its aliquot parts (1, 2, 3) summing to itself — and connects this self-sufficiency to the archetype of wholeness, the Lover, and the six-pointed star as a union of opposing triangles. Hamaker-Zondag similarly notes Six’s arithmetical peculiarity as foundational to its symbolic meaning. In the I Ching literature, ‘six’ operates as a technical term designating yin lines within hexagrams, and the canonical phrase ‘Six in the [nth] place’ is the primary vehicle through which line-by-line oracular commentary is delivered across all major translations (Wilhelm, Huang, Ritsema/Karcher). Here Six is structural rather than symbolic, naming the yielding, receptive principle embedded in positional logic. In the Tibetan Buddhist corpus, Six organizes cosmological categories: six realms of rebirth, six dissonant mental states, six bone ornaments, six intermediate states. A minor but distinct thread concerns the ‘Six Step’ word-of-mouth program historically antecedent to AA’s Twelve Steps. Across all traditions, Six carries valences of completion, receptivity, and structured articulation of multiplicity.