And what is this tree?
“The tree grew and became strong, and its top reached to heaven, and it was visible to the end of the whole earth.
12 Its leaves were beautiful and its fruit abundant, and in it was food for all. The beasts of the field found shade under it, and the birds of the heavens lived in its branches, and all flesh was fed from it.”
https://ref.ly/Da4.11-12 via the Logos Bible Android app.
Discussion
The tree is not a what but who, that would be Nebuchadnezzar