Basic Math Symbols

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Across
  1. 2. ≈
  2. 6. mod
  3. 9. greater than or less than
  4. 11. plus sign
  5. 12. minus sign
  6. 14. decimal separator
  7. 17. %
  8. 19. x
  9. 20. power
Down
  1. 1. equals sign
  2. 3. ppm; per-
  3. 4. horizontal line
  4. 5. ppt; per-
  5. 7. []
  6. 8. calculate expression inside first
  7. 10. /
  8. 13. *
  9. 15. ÷
  10. 16. ppb; per-
  11. 18. exponent