What do the Black Flag bars mean?

Related questions

1. What does black flag mean on Instagram?
2. Does Greater London have a flag?
3. Is it illegal to fly a pirate flag?
4. What does the blue dot mean on Instagram next to someone's name?
5. What does a black bandana mean?
6. Is there a star Emoji?
7. What does raising a black flag mean?
8. Is there an England flag emoji?
9. What does the red flag emoji mean?
10. What is the poop emoji meant to be?

Tags

1. #white
2. #pettibon
3. #brother
4. #raymond
5. #stated
6. #represented
7. #suggested
8. #surrender
9. #anarchy
10. #comfortable
11. #stylized
12. #implications
13. #artist
14. #means
15. #represents
16. #designed
17. #black