Why is 9 lucky for china and not japan?

The number 9 is considered lucky in many cultures, including Chinese culture. In China, the number 9 is associated with the emperor and is seen as a symbol of power and authority. It is also associated with longevity, good fortune, and wealth. In Japan, the number 9 is not considered to be particularly lucky. In fact, the number 4 is considered to be the most unlucky number in Japan, as it is associated with death.