What is the Great Britain flag called?

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Tags

1. #century
2. #known
3. #british
4. #saltire
5. #andrew
6. #there
7. #various
8. #union
9. #first
10. #cross
11. #appeared
12. #britain
13. #england
14. #george
15. #theories
16. #included
17. #scotland
18. #became