The ancient Egyptian "Eye of Horus" symbolizes healing and protection and is also associated with the waxing and waning of the moon.© DEA/W. BUSS/Contributor via Getty Images ...

The Eye of Horus was also associated with the waxing and waning of the moon, which may have helped increase its appeal, said Gyula Priskin, an ancient historian at the University of Szeged in Hungary.

The Eye of Horus was also associated with the waxing and waning of the moon, which may have helped increase its appeal, said Gyula Priskin, an ancient historian at the University of Szeged in Hungary.

The Eye of Horus engraved on a gold plate. This artifact was found in the tomb of the ancient Egyptian pharaoh Psusennes I, who ruled more than 3,000 years ago. . | Credit: DEA / S. VANNINI via ...

The Eye of Horus was also associated with the waxing and waning of the moon, which may have helped increase its appeal, said Gyula Priskin, an ancient historian at the University of Szeged in Hungary.