Why did Odin hung himself in Yggdrasil for nine days?

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Tags

1. #nights
2. #symbolic
3. #threw
4. #spear
5. #understand
6. #sacrificed
7. #himself
8. #mimir
9. #ritual
10. #hanged
11. #other
12. #knowledge
13. #sacrifice
14. #runes
15. #gungnir
16. #worlds
17. #order
18. #suicide
19. #yggdrasil