What does the flame mean in Words With Friends?

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Tags

1. #player
2. #progress
3. #another
4. #feature
5. #flame
6. #moreover
7. #ongoing
8. #still
9. #operates
10. #opponent
11. #therefore
12. #streak
13. #multiple
14. #words
15. #single
16. #other
17. #affect
18. #emoji
19. #events
20. #between
21. #friends
22. #games