How do I know if I have retina display?

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Tags

1. #click
2. #display
3. #retina
4. #apple
5. #check
6. #model
7. #choose
8. #identifier
9. #macbookpro10
10. #system
11. #about
12. #lower
13. #starts
14. #macbookpro9
15. #report