What does the hot sign at Krispy Kreme mean?

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Tags

1. #hosts
2. #pressed
3. #employee
4. #lights
5. #inside
6. #button
7. #synced
8. #donuts
9. #igniting
10. #ready
11. #kreme
12. #presses
13. #store
14. #virtually
15. #fresh
16. #tangible
17. #batch
18. #every
19. #light
20. #krispy