Basic Math Symbols

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Across
  1. 2. -
  2. 4. %
  3. 6. +
  4. 8. pbb
  5. 11. .
  6. 13. <
  7. 14. obelus
  8. 15. both minus and plus operation
  9. 18. ‰
  10. 19. asterisk
  11. 20. power
Down
  1. 1. []
  2. 3. ≈
  3. 5. remainder calculation
  4. 7. 1ppm=1/1000000
  5. 9. exponent
  6. 10. ()
  7. 12. not equal sign
  8. 16. ppt
  9. 17. =