Study chinese in china

mouth   口[kou] (the third tone) Like several of the first characters we shall learn, the character for mouth is a clear pictograph. Since there are no circular shapes in the characters, the square must be used to depict the circle.
As a primitive, this form also means mouth. Any of the range of possible images that the word suggests—an opening or entrance to a cave, a river, a bottle, or even the largest hole in your head—can be used for the primitive meaning.