ᚅ Nion — ash / spine
World-linking axis
Nion, associated with ash, is often linked in modern tables to the spine and the vertical world-linking axis. The front-view midline point makes the axis visible even though the physical spine lies posteriorly, so this is a deliberate projection convention.
Point 3 of 15 in Celtic Ogham — tree-letter body correspondences
Cross-tradition overlaps
No overlapping points are registered for this point.
Sources
Auraicept na n-Éces (primary_canonical)
Supports Nion/ash and its learned Ogham context, not a spinal map.
Damian McManus, A Guide to Ogam (scholarly_modern)
Supports the letter and tree identification; spine/world-linking is the selected modern synthesis.