What are the different features or characteristic of numeration system?

Numeration systems are characterized by several key features, including the base or radix, which determines the number of unique digits used (e.g., base-10 uses digits 0-9). They also have a place value system, where the position of a digit affects its value based on powers of the base. Additionally, numeration systems can be additive or multiplicative, influencing how numbers are represented and calculated. Finally, they may include symbols for zero and negative numbers, which enhance their functionality.