Basic Math Symbols

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Across
  1. 2. n√a
  2. 4. 1ppb = 1/1000000000
  3. 5. √a
  4. 6. ppt
  5. 7. decimal point, decimal separator
  6. 8. division / fraction
  7. 9. *
  8. 11. exponent
  9. 12. mod
  10. 13. calculate expression inside first
  11. 14. ±
  12. 17. [ ]
  13. 18. −
Down
  1. 1. ‰
  2. 3. ≈
  3. 6. ±
  4. 7. %
  5. 10. 3√a
  6. 15. less than or equal to
  7. 16. addition