Three, six or nine?

[Pinyin]

sān liù jiǔ děng

[Explanation]

It refers to many levels and categories, with various differences.

[Source]

Chapter 75 of "A Dream of Red Mansions" by Cao Xueqin of the Qing Dynasty: "You rabbits are really heartless and oblivious kids! Whose are you in the same place every day? Well, don’t you agree? It’s just that you’ve lost a few taels of silver, so you’re just like this.”