Why is the figure 9 like a peacock?

Why is the figure 9 like a peacock?
 

Because without its tail it is nothing (0).

为什么数字9象孔雀一样？
 

因为孔雀尾巴最漂亮，如果没有尾巴的话，它就什么都没有，9去掉尾巴是0即nothing。