The number 9 in Chinese sounds very similar to 久, jiŭ which translates to “long-lasting” or “eternity”.
In fact, both characters have the same pinyin and the same tone, meaning they sound exactly the same.
Due to this, it’s an example of a number that is used at Chinese weddings and also birthdays! The number represents longevity so is perfectly apt for either of these celebrations.
Other examples of joy the number 9 brings in China are:
To signify everlasting love, 99, 999, or 9999 roses are usually sent to present the eternal love.
The number 9 is also traditionally associated with the Chinese emperor. His robes had 9 dragons on them and officials were organized in, yep, you guessed it, 9 ranks.
The Forbidden City is known to have a total of 9,999 and a half rooms, obviously!