The carry system/position counting method is a counting method, so it is also called the carry counting method/place value counting method, which can use a limited number of symbols to represent all values. The number of digital symbols that can be used is called radix (en:radix) or base. The radix is n, which is called n-carrying system, or n-ary for short. The most commonly used nowadays is the decimal system, which usually uses 10 Arabic numerals 0-9 for counting.
