What is the More icon on twitter?

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Tags

1. #icons
2. #first
3. #message
4. #photo
5. #video
6. #looking
7. #someone
8. #means
9. #twitter
10. #rectangle
11. #balloon
12. #something
13. #empty
14. #current
15. #replied
16. #tweet
17. #links
18. #media
19. #description