What is a device token for Iphone?

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Tags

1. #issued
2. #gateways
3. #google
4. #tokens
5. #targeting
6. #which
7. #devices
8. #lower
9. #device
10. #specific
11. #answer
12. #requests
13. #notification
14. #apple
15. #combination
16. #token
17. #unique