Within the depth-psychology corpus, the number eight occupies a position of exceptional symbolic density, situated at the threshold between completion and renewed becoming. The literature converges on several interpretive axes: eight as the number of perfection and total receptivity (Jodorowsky), eight as an octagonal, baptismal form encoding psychic regeneration after dissolution (Edinger), eight as a structural marker of cosmic and cultural order — from the Egyptian Hermopolis to Chinese immortals (Hamaker-Zondag) — and eight as a numerological signifier of transcendent connection, the octagonal star linking heaven to earth (Banzhaf). A productive tension runs through these accounts: eight may represent stabilising completion (4 + 4), yet this very doubling risks entrenchment or stagnation. Hamaker-Zondag, working in a Jungian astrological register, assigns eight to Saturn while simultaneously reading its mandala-form as evidence of psychic reconsolidation. Neumann identifies eight in the transitional zone of an Etruscan cosmological lamp, bridging lunar-watery and airy-fiery registers. In the I Ching tradition, eight is the stable yin symbol, Lesser Yin, the line that does not move. Greer, reading through Kabbalistic-Tarot correspondence, assigns eight to Uranus and the sephirah Hod. The term thus carries layered valences — saturnine fixity, receptive perfection, baptismal renewal, and celestial-terrestrial mediation — making it one of the numerologically richest terms in the corpus.