The Ogham alphabet of the Celts was based on tree form, each letter representing a tree. Each of these pendants bears the Ogham letter corresponding to a sacred tree - Coll, the hazel, associated with wisdom and poetry; Duir, the oak, symbol of strength and knowledge; and Nion, the ash, symbol of healing and protection. Sterling silver pendants etched with leaf texture and accented with copper wire. On 18" chain. Certified Fair Trade. Choose Hazel, Oak or Ash.