What is the hidden symbol in the FedEx logo?

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Tags

1. #facing
2. #linden
3. #arrow
4. #subliminal
5. #appears
6. #leader
7. #right
8. #intended
9. #fedex
10. #simple
11. #space
12. #straightforward
13. #speed
14. #white
15. #between
16. #landor
17. #first
18. #precision
19. #associates
20. #however
21. #hidden
22. #symbol
23. #designed