The carry rule of binary system is "every binary system is one", and the borrow rule is "borrow one as two".
Decimal system, that is, carry counting system, is an artificially defined carry counting method (whether there is a carry counting method, such as the original knot counting method, the "positive" word counting method commonly used in singing tickets, and similar counting mark counting method).
For any binary-X system, it means that the number of each position is calculated by each X system.
Decimal is a decimal one, hexadecimal is a hexadecimal one, binary is a binary one, and so on. The X-system is every X-carry, and the carry/position counting method is a counting method, so it is also called the carry counting method/bit value counting method, and all values can be represented by a limited number symbol.
The number of digital symbols that can be used is called radix or radix. If the radix is n, it can be called N-ary, or N-ary for short. At present, the decimal system is most commonly used, and it is usually counted by the Arabic numerals 0-9 of 10.