600 is the numeric value of the Greek letter chi (Χ, χ), the twenty-second letter of the alphabet. In the standard Milesian system of Greek numerals, chi occupies the place of 600, a value that appears in no other Greek letter. The letter itself is the source of the Latin X and has been used as a numeral since at least the 5th century BCE, often written with a horizontal bar or a superscript to distinguish it from the alphabetic character.

Position on the Tree of Life

On the Tree of Life, 600 corresponds to the ninth sephirah, Yesod (Foundation). This placement is unique among the Greek numeral values assigned to the sephiroth in Liber 777: no other sephirah receives 600. Yesod is the sphere of the Moon, the astral plane, and the formative power that stabilizes and transmits energy from the higher sephiroth down to Malkuth. The number 600 thus becomes a glyph for the lunar foundation, the threshold between the ideal and the material.

Astrological and planetary correspondence

Because 600 sits at Yesod, its astrological correspondence is the Moon. In Greek magical papyri and later Hermetic texts, the Moon is associated with change, reflection, and the subtle body. The number 600, as chi, also carries a solar‑lunar duality: chi is the first letter of Christ (Χριστός) in Christian Greek, linking it to the Logos, while its lunar station on the Tree emphasizes the receptive, formative aspect of the divine light.

Historical context

The Greek numeral system, in use from the Hellenistic period through the Byzantine era, assigned numeric values to letters in three groups: units (1–9), tens (10–90), and hundreds (100–900). Chi (600) belongs to the hundreds group, alongside phi (500), psi (700), omega (800), and sampi (900). In early Christian iconography, the chi‑rho monogram (ΧΡ) combines chi (600) and rho (100) to form the first two letters of Christ, making 600 a sacred number in Christian numerology. The number also appears in the Septuagint and New Testament as a numeral in genealogies and ages (e.g., Noah’s age at the Flood, Genesis 7:6, is 600 years in the Hebrew text; the Greek Septuagint preserves the same number).

In Greek isopsephy (the practice of summing the numeric values of words), 600 is the value of the word “κόσμος” (kosmos, “world”) when certain spellings are used, and of “πνεῦμα” (pneuma, “spirit”) in some variants. These associations reinforce the Yesod connection: the foundation of the world and the breath of life. Later, in the Hermetic and Kabbalistic synthesis of the Renaissance, 600 was linked to the lunar sphere and to the letter Samekh in Hebrew (though Samekh is 60, not 600) by analogy of shape and function. The number’s presence in Liber 777 as the Greek numeral for Yesod formalizes this long‑standing current.

In Liber 777

In the table of Liber 777, the cell at row “Numeration of Greek Alphabet” and column “Numeration of Greek Alphabet” for the ninth step (Yesod) is 600. This entry anchors the Greek letter chi to the lunar sephirah, providing a direct numeric key for ritual and meditative work on the foundation of the Tree. The number 600 here is not merely a count but a symbol of the stable, reflective power that underlies all manifest form.