(1) indicates that there is no unit somewhere: for example, the "0" in 305 and 0.05 indicates that there is no unit somewhere.
(2) Indicates the starting point: for example, mark a "0" on the scale line at the starting point of the ruler.
(3) used for numbering: for example, 0068 will let people know that the largest number is four digits.
(4) Boundary: We often say that a certain temperature is 0 degrees Celsius and the height of the horizontal plane is 0 meters. Here, 0 degrees Celsius is not without temperature, and 0 meters is not without height; 0 is used here as a quantitative limit.
Extended data:
Related properties of the number 0:
1, 0 is the smallest natural number.
2,0 can be divisible by any non-zero integer.
3,0 is not an odd number, but an even number (a special even number that is not positive or negative).
4.0 is neither a prime number nor a composite number.
5.0 occupies a position in multiple digits. For example, 0 in 108 means there are no ten digits. Never write 18.
6,0 cannot be used as a multi-digit most significant bit. However, some numbers need to be preceded by 0 to complete all the numbers.
7,0 is neither positive nor negative, but the dividing point between positive and negative numbers. When a certain number x is greater than 0 (that is, X>0), it is called a positive number; On the other hand, when x is less than 0 (that is, x