In Egyptian art, a representation of the eye of the falcon god Horus. The wedjat had an apotropaic function, and so was often depicted on amulets placed inside mummy wrappings to protect the deceased in the afterlife. (Also spelled wadjet and udja).
Wedjat amulet. From Egypt. Faience and aragonite. Ca. 1070-664 BCE. Metropolitan Museum of Art, New York.