which is a picture of nose.
Originally, the character meant Nose. But the meaning changed later to Self. Why did ancient Chinese use nose to be Self? Because Chinese like to use a finger to point to his or her nose when they say "me" or "self" (Americans like to point to his or her chest), so the nose represents "self".
The big seal script of the character is
which changed a lot, but still has some similarity to a nose.
The clerical script is
which is similar to the small seal script.
The song typeface of the character is
which is very similar to the clerical script.
Its pinyin is Zi4.