What does ☂ mean?

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Tags

  1. #category
  2. #concepts
  3. #example
  4. #encompasses
  5. #belonging
  6. #range
  7. #among
  8. #cryptography
  9. #common
  10. #covers
  11. #other
  12. #fields
  13. #cryptanalysis
  14. #phrase
  15. #cryptology
  16. #umbrella