The number twelve occupies a peculiar lacuna in the depth-psychology concordance: unlike the extensively theorized numbers three, four, seven, and ten, twelve receives no sustained doctrinal treatment in the canonical Jungian or post-Jungian corpus represented here. The passages retrieved yield no direct thesis concerning twelve as a psychological archetype, a symbol of wholeness, or a structural principle of the psyche. What the corpus does offer, obliquely, is a rich theoretical surround: the Neoplatonic meditation on Number as such (Plotinus), the Jungian insistence on the numinosity and irreducibility of natural numbers (von Franz), the medieval and alchemical privileging of quaternary and septenary structures (Jung, Pauli), and the Tarot tradition’s numerological calculus (Greer, Hamaker-Zondag). Within this surround, twelve is recognizable as a number of completion — the product of three and four, the count of zodiacal signs, of apostles, of tribes — yet none of the texts here theorizes it explicitly as such. The concordance entry therefore documents the theoretical frameworks within which twelve would be read, rather than readings of twelve itself, and flags the significant silence as itself a datum about where depth psychology has directed its symbolic energies.