Definition of Non positional number systems?

Answer 1

In the non positional number system, the value of the number does not depend upon the position of "digits" used to represent the number. Unlike the positional number system, in non positional system every number, as a whole, is represented as a combination of certain specific symbols. Therefore, according to me, there is no such a notion of "digits" in the non positional system.

The classic example of non positional number system is the Roman number system in which the numbers are represented by certain specific symbols:

I for 1

II for 2

X for 10

XX for 20 etc.