The thirty-second and last path runs down the base of the central Pillar of Equilibrium from Yesod, Foundation, to Malkuth, the Kingdom, the final step by which the whole descending flow of the Tree arrives in the material world. It carries the letter Tav, the last letter of the Hebrew alphabet, whose name means "mark", "sign" or "cross", the mark set as a seal or a completion; in Ezekiel the tav is the mark set on the foreheads of the righteous.
In the Sefer Yetzirah Tav is one of the seven double letters assigned to the seven planets, and it is given to Saturn, the outermost and slowest of the classical planets, the bound of the visible cosmos, fitting for the final letter and the last path at the threshold of the material world. The seven doubles map onto the seven planets, and the pairing of the last letter with Saturn, the planet of limit, ending and materiality, comes from this ancient Jewish attribution.