Why are the Seahawks called the 12s?

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Tags

1. #texas
2. #seattle
3. #referring
4. #between
5. #their
6. #using
7. #agreement
8. #instead
9. #honor
10. #december
11. #jersey
12. #retired
13. #ceased
14. #number
15. #seahawks
16. #virtually
17. #struck