What other parts of human body are unique other than finger prints?

Retina

The very back of the eye, the retina, is a precise snapshot of your nervous system, unique to you. It displays a pattern of blood vessels that your eye doctor observes to detect the first signs of diabetes, high blood pressure, and even declining brain health. Though human retinas are typically only observed at the optometrist, retina identification is widely used in the animal world to verify show cattle and purebred horses and to track disease outbreaks.