What does Kappa mean in twitch?

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Tags

1. #sarcasm
2. #informal
3. #where
4. #called
5. #utter
6. #employee
7. #inflicts
8. #justin
9. #casts
10. #given
11. #twitch
12. #deseno
13. #captured
14. #kappa
15. #statement
16. #picture
17. #denotes
18. #former
19. #greyscale