The Ash in Celtic Ogham symbolizes wisdom, justice and the pursuit of knowledge, both practical and magical knowledge. Ash trees were used to make magical spears and staffs. The Ash is associated with the God Lugh, who is a God of a law and order and also the "God of many skills" it's also associated with the Goddess Andraste. The Ash is a solar stave and is connected to the sun. Ash is associated with seeking balance.

Photos from above colorized.

Photos colorized