

Numeral system  Wikipedia, the free encyclopedia 
  Numeral systems are sometimes called number systems, but that name is misleading: different systems of numbers, such as the system of real numbers, the system of complex numbers, the system of padic numbers, etc., are not the topic of this article. 
  The simplest numeral system is the unary numeral system, in which every natural number is represented by a corresponding number of symbols. 
  The numeral system of English is of this type ("three hundred [and] four"), as are those of virtually all other spoken languages, regardless of what written systems they have adopted. 
 en.wikipedia.org /wiki/Numeral_system (3472 words) 
