What does the fire mean in Words With Friends?

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Tags

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