What does the D mean in one piece?

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Tags

1. #those
2. #ancient
3. #known
4. #government
5. #people
6. #middle
7. #their
8. #stands
9. #civilizations
10. #carry
11. #which
12. #civilization
13. #these
14. #world
15. #stand
16. #devil
17. #against
18. #supposed
19. #piece