Why is it called the o3 arena?

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Tags

1. #residency
2. #venue
3. #actually
4. #tonight
5. #drake
6. #anyway
7. #night
8. #starts
9. #london
10. #spotting
11. #reference
12. #rapper
13. #changed
14. #opportunity
15. #arena
16. #literal
17. #seven