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is an option for NumberForm and related functions which gives the string to insert at breaks between digits.
  • NumberSeparator->"s" specifies that the string s should be inserted at every break between digits specified by DigitBlock.
  • NumberSeparator->{"sleft", "sright"} specifies different strings to be used on the left and right of the decimal point.
  • The default setting is NumberSeparator->{", ", " "}.
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