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A number is an abstract idea used in counting and measuring. A symbol which represents a number is called a numeral, but in common usage the word number is used for both the idea and the symbol. Numbers can be classified into sets, called number systems. Also, natural, integers, real, irrational, rational, negative, complex, prime, transcendental, superreal, hyperreal, surreal, imaginary, etc., are all used to describe and refer to numbers.
The subject matter of numbers is so deep and wide in human history that it includes almost all thought processes in philosophy, physics, sciences, hypotheses' and concepts. The idea that "math is "conceptual" could not be a truer statement!
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