What does THX mean in movies?

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Tags

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2. #around
3. #lucas
4. #sound
5. #being
6. #others
7. #worked
8. #while
9. #experiment
10. #comes
11. #holman
12. #return
13. #first
14. #george
15. #lucasfilm
16. #filmed
17. #stands
18. #tomlinson