( haluppu tree; Biblical Tree of Wisdom) Norse World Tree; a great ash tree that makes up the axis of the universe and whose roots spread out to nine worlds and are gnawed on by the serpent Nidhog; Odin hung on it for nine days and went through a spiritual death and rebirth

(Norse mythology) a huge ash tree whose roots and branches hold the earth and heaven and hell together

In Norse mythology, Yggdrasil (Old Norse Yggdrasill, ; the extra -l is a nominative case marker) is the "World Tree", a gigantic ash tree, thought to connect all the nine worlds of Norse cosmology. Sometimes it is called Mímameiðr or Lérað. According mythology, Ásgard, Álfheim and Vanaheim rest on the branches of Yggdrasil.

Yggdrasil is a folk band playing mainly compositions by Kristian Blak and interpretations of ethnic material from the North Atlantic region: Faroese ballads, hymns, rhymes – Inuit songs – Shetland music. – Ethno-jazz - world music. The band is named after the world tree Yggdrasil.

Yggdrasil is the name of a fictional character in several iterations of the Digimon franchise, named after the world tree from Norse mythology. He primarily factors into the backstory written for the Digimon virtual pets and card game, which is a background storyline that is less prominent and often contradictory to the various anime. He appears as a character in Digital Monster X-Evolution and Digimon Savers.