Amulet

Probably an amulet. The eye of Horus is also known as the Divine eye or Mystic eye.

The van Haersolte Collection

Amulet of Uzait Horu, or sacred eye of Horus. This is the quadruple form of the sacred eye design, which is repeated symetrically four times. The design is emphasized with black lines and the amulet is pierced with a hole that runs from side to side.