What is the 3 digit code on the back of an American Express?

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  1. #levels
  2. #which
  3. #highly
  4. #reason
  5. #itself
  6. #digits
  7. #contained
  8. #digit
  9. #calculated
  10. #strip
  11. #normal
  12. #value
  13. #based
  14. #security
  15. #number
  16. #secure
  17. #verification
  18. #magnetic
  19. #printed