Why white box testing is called glass box testing?

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1. #tester
2. #inside
3. #white
4. #named
5. #internal
6. #testing
7. #because
8. #system
9. #clearly
10. #analysis
11. #transparent
12. #definition
13. #based
14. #method
15. #program
16. #component
17. #structure
18. #which
19. #istqb
20. #software