What does 3 bars mean?

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  1. #according
  2. #pressure
  3. #water
  4. #withstand
  5. #square
  6. #limited
  7. #means
  8. #resistant
  9. #entering
  10. #bearing
  11. #equivalent
  12. #describing
  13. #period
  14. #being
  15. #tested
  16. #column
  17. #watch
  18. #without