Amazing Chinese Characters (500) Pee - 尿

 The shell bone script of character Pee is

A person (male) is peeing.

The big seal script of character Pee is

The top is character Body (Post 423), the bottom is character Water (Post 13). Pee is water from body. 

The small seal script of character Pee is

The top is character Tail - 尾（Post 501), the bottom is character Water. Tail is part of tail bone plus hair, is part of Body. Tail indicates the outlet of pee.

The clerical script of character is 

Body plus Water.

The Pinyin of character Pee - 尿 is Niao4.