M — the thirteenth letter of the Hebrew alphabet, Mem (מ), whose name means ‘water.’ Its phonetic value is M, and its numerical value (as used in gematria) is 40. In the Hebrew script, Mem has two forms: the open Mem (מ) used at the beginning or middle of a word, and the final Mem (ם) closed on all sides, used at the end of a word. This duality of open and closed water is the central glyphic symbol of the letter.

Position on the Tree of Life

Mem is the Path 23, connecting Hod (8) with Geburah (5). This diagonal path on the Tree of Life crosses the Abyss and is associated with the element of Water in its most concentrated, formative aspect. The path’s step number 23 corresponds to the value of the Hebrew letters forming the word Chokmah (Wisdom) in its numerical reduction, hinting at the transformative wisdom that flows through the channel of Mem.

Astrological and planetary correspondence

Mem’s primary astrological attribution is Water elemental—the pure, undifferentiated fluid that receives all forms. It is not assigned to a specific planet or zodiac sign but to the element itself. In the scheme of the 32 Paths, Mem is the eighth Path of the letter–element pairs, standing as the sole water letter among the three Mother letters (Aleph = Air, Mem = Water, Shin = Fire). This elemental Water corresponds to the sphere of Yesod (Foundation) on the Tree, but the Path of Mem emanates from the sephirah Geburah (Severity) and ends at Hod (Splendor), channeling a martial, discerning aspect of water—the water that cuts and dissolves, as opposed to the still or generative waters of Binah or Chesed.

Historical context

The Hebrew letter Mem is one of the three Mother letters (אמש) in the Sefer Yetzirah, the foundational text of Jewish mystical cosmology (c. 2nd–6th centuries CE). In the Sefer Yetzirah (3:1-9), Mem is described as the letter that ‘silences,’ ‘carries,’ and ‘sweetens’—it governs the sense of taste (the tongue that perceives water), the month of Shevat (the rainy month in the Jewish calendar), and the belly (the organ that contains fluids).

In later Kabbalistic development, particularly in the Zohar and the writings of Moses Cordovero and Isaac Luria, Mem’s closed and open forms are interpreted as the secret of the primordial waters above and below the firmament (Gen. 1:6-7). The open Mem represents the water of mercy that flows outward; the closed final Mem represents the water of judgment locked within the depths, or the sealed source of the supernal sea. This dual nature aligns with the Path’s position between the harshness of Geburah and the precision of Hod—water that can both erode stone and splendorously reflect light.

In the Hermetic Order of the Golden Dawn’s interpretation of the 777 Table, Mem is assigned the High Priestess card (Atu II) in the Tarot. The card shows a seated woman holding a scroll (Torah) between two pillars, with a veil behind her—all symbols of the receptive, hidden, and fluid nature of the letter. The letter itself stands for death and rebirth in the initiation rituals of the Order, because water dissolves the old form before a new one emerges. The number 40 (gematria of Mem) appears repeatedly in biblical and initiatory contexts: 40 days of the flood, 40 years in the desert, 40 days of Jesus’s temptation.

In the 777 Table

At row LI.3 (English equivalent of Column LI), the value given for Path 23 is simply the letter M. The table thus records the direct alphabetic correspondence of the English letter ‘M’ as the most concrete token of the Mem force at this step, usable in practical talismanic work and in the construction of divine names and words of power on the 23rd Path.