The Tree of Life symbol crosses over all the Celtic Nations and Viking Mythology. 
To the Celts, trees were an important part of their beliefs and culture, representing how the forces of nature come together to create harmony and balance.
To the Vikings, Yggdrasil is tree of life. It sits in the middle of Asgard, where the Gods and Goddesses live. It is an eternal green Ash tree with branches stretching out over all of the nine worlds, extending up and above the heavens.