This is a double-sided St. Benedict pendant with an image of the saint on the front and the St. Benedict cross on the back.

St. Benedict is the patron saint of monks and poison sufferers. Benedict was the founder of Western monasticism, and wrote a set of guidelines for monks to follow. Many opposed his Benedictine principles, and he was once given a goblet of poison, which he blessed and made safe. He is buried with his twin sister, Saint Scholastica.