What did Blackbeard's flag mean?

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Tags

1. #surrender
2. #blood
3. #heart
4. #signify
5. #signified
6. #holding
7. #dagger
8. #would
9. #skeleton
10. #other
11. #unusual
12. #pirates
13. #flags
14. #three
15. #drawn
16. #glass
17. #drops
18. #blackbeard
19. #flown
20. #running