What do the colors on the Barcelona flag mean?

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Tags

1. #current
2. #ancient
3. #catalan
4. #jordi
5. #george
6. #horizontal
7. #stripes
8. #barcelona
9. #traditional
10. #vertical
11. #symbol
12. #patron
13. #combines
14. #though
15. #saint
16. #cross
17. #aragon
18. #catalonia
19. #senyera
20. #crown
21. #yellow
22. #modern