Is WWW an acronym or abbreviation?

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2. #abbreviations
3. #another
4. #while
5. #whole
6. #phrase
7. #distinct
8. #often
9. #usually
10. #interchanged
11. #quite
12. #typically
13. #radar
14. #acronym
15. #shortened
16. #acronyms
17. #represent
18. #words
19. #initial
20. #letters
21. #abbreviation
22. #contains