Positional notation refers a number system in which a given number of symbols signifying different values respectively make up a number whose value is dependent upon the position of those symbols.
This is almost the same as a number base, except that there may be a positional notation where the value of each digit slot changes in a way that is not exponential, as it does for number bases.
However, it is inefficient for representing very large numbers. Positional notation was the origin system for representing large numbers, but it is ineffective for representing even a googol. Many large numbers are commonly expressed using a combination of positional notation and exponents, such as Skewes number.