Pe פ — Mercury / lungs
Double letter; planetary and organ analogue
The seven Doubles are explicitly paired with the seven planets in Sefer Yetzirah. The organ wording is a later medical correspondence, so each point is rendered as a compact symbolic seat with widened uncertainty rather than as a textual anatomical coordinate.
Point 8 of 22 in Sefer Yetzirah Letter Body
Cross-tradition overlaps
- Pe פ — Mercury / lungs ↔ Mercury — lungs, nerves, speech (distance 0.010)
Sources
Sefer Yetzirah (primary_canonical)
Chapters 3–5 classify the three Mothers, seven Doubles, and twelve Elementals, with planetary and zodiacal correspondences; cited by chapter and section in Kaplan’s standard English edition.
Aryeh Kaplan, Sefer Yetzirah: The Book of Creation in Theory and Practice (secondary_translation)
Commentary and tables explain the letter groups, planets, zodiac signs, and later body analogies; see commentary to chapters 3–5.