Nail
In medicine, there are two types of nails.
One is just a plain old metal nail used to hold 2 or more pieces of bone together, for example, after a fracture.
The other type of nail is the horny plate on the end of the finger or toe.
Each nail anatomically has a body, lateral nail folds (on the sides), a lunula (the little moon-shaped feature at the base), and a proximal skin fold (at the base)