Yggdrasil

The sacred giant tree Yggdrasil or Yggdrasill in Norse mythology is a world tree which supports all else in the universe, including the many different realms. It is said that Odin once hanged himself from the tree as a sacrifice to gain wisdom, which may be where the name comes from – traditionally, gallows were known as the "dead man's horse".

Pronounced IG-drah-sil.