• zero... and as far as I know, any negative number...
    • bostjan64
      Zero is indicated by "N," and not just in modern times, but there are examples of it back in antiquity. Some argue that it is not a numeral, because it cannot be used in combination with any other roman numeral, but I dismiss that, since a "numeral" is defined as any graphic denoting a number. Since zero is a number, "N" is a numeral.
      Hmmm...I didn't know that.
  • Three examples: 1. Any irrational number, for instance pi. 2. Any complex number with an imaginary component, for instance i. 3. Any rational number except those which can be denoted as a whole number of twelfths.

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