What does the squiggly equal sign mean?

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Tags

1. #occasionally
2. #symbolized
3. #equal
4. #approximately
5. #engineering
6. #physics
7. #close
8. #difference
9. #quantities
10. #primarily
11. #enough
12. #equality
13. #approximate
14. #concept
15. #mathematics
16. #terms
17. #practical
18. #squiggly
19. #value
20. #inconsequential