Numbers refer to the position of a number in a number; Cardinality refers to the number of digits that can be used for each digit in a carry counting system. For example, the radix of a binary number is 2, and the number of digits that can be used in each digit is 0 and 1. There is a rule in the number system. If it is an n-ary number, it must be 1 on every n-ary number. For multiple digits, "in a certain position"

The size of the numerical value represented by 1 "is called bit weight. For example, the bit weight of the second bit is 2 and the bit weight of the third bit is 4. Position weight is a mathematical term, which is the unit value corresponding to each fixed position in the index system. For example, a decimal number is represented by each decimal number. Multiple bits For multiple bits, the size of the numerical value represented by "1" on a certain bit is called bit weight.