What do the 3 dots on iMessage mean?

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Tags

1. #screenshot
2. #screen
3. #interaction
4. #awareness
5. #close
6. #dismiss
7. #three
8. #notification
9. #about
10. #indicates
11. #apple
12. #appear
13. #thought
14. #imessage
15. #indicator
16. #typing
17. #other
18. #someone
19. #insider