
 natural number 
  The debate about whether zero should also be included as a natural number has been going on for hundreds of years, and there's no general agreement even today. 
  To avoid confusion, 0, 1, 2, 3,..., are often referred to as nonnegative integers or whole numbers, while 1, 2, 3,..., are called positive integers. 
  An important property of the natural numbers is that they are wellordered, in other words, every set of natural numbers has a smallest element. 
 www.daviddarling.info /encyclopedia/N/natural_number.html (274 words) 
