Cornicello

A cornicello (), cornetto (; ), corno (Italian for "horn"), or corno portafortuna (literally "horn that brings luck" in Italian) is an Italian amulet or talisman worn to protect against the evil eye (or "malocchio" in Italian) and bad luck in general, and, historically, to promote fertility and virility. In Neapolitan, it is called or variants thereof. The amulet is also sometimes referred to as the Italian horn.
Origins and styles.
A cornicello is a twisted horn-shaped charm often made of gold, silver, plastic, bone, terracotta, or red coral. Cornicelli are thought to be modeled after an eland horn, to represent fertility, virility, and strength. The shape and colour of the red cornicelli are reminiscent of a chili pepper. The evil eye is believed to harm nursing mothers and their babies, bearing fruit trees, milking animals, and the sperm of men - the forces of generation. In addition to being worn as jewelry, cornicelli are sometimes hung from the rearview mirrors of cars (based on the older custom of using them to protect draft horses), and in houses.
The cornicello is also linked to Greek and Roman mythology. The cornucopia became a symbol of fertility and the earth after Zeus broke a horn from a goat. He filled it with fruit and flowers and gave it to his caretaker. The coral of which it is often made is sacred to Venus, goddess of love, fertility, sex, and prosperity. Silver, of which it is also often made, is sacred to Luna, goddess of the moon. The phallic shape and red color is also a reference to Priapus, a male fertility god.
A regionally popular amulet, they are most often worn by Italian men in the region of Campania, as well as Lazio, Marche, Abruzzo, Calabria, Basilicata, Lombardy, and Friuli-Venezia Giulia and elsewhere among descendants of Italian immigrants.
Related.
Possibly related to the corno is the "mano cornuta" or "horned hand." This is an Italian hand-gesture (or an amulet imitative of the gesture) to ward off the evil eye. "Mano" means "hand" and "corno" means "horn." This gesture is performed with the hand leveled or pointing down, or at least slightly downward, usually with a swiveling or oscillating motion.