What is "engolpion"

An engolpion or enkolpion, formerly called an encolpion ( Greek: ἐγκόλπιον, enkólpion, "on the chest"; plural: ἐγκόλπια, enkólpia), is something worn upon the bosom. Formerly also including pectoral crosses, enkolpion is nowadays used for a medallion with an icon in the center, worn around the neck by Orthodox and Eastern Catholic bishops. The icon is normally surrounded by jewels (usually paste) and topped by an Eastern-style mitre, and will often have a small jewelled pendant hanging down at the bottom. The engolpion is suspended from the neck by a long gold chain, sometimes made up of intricate links. A portion of the chain will often be joined together with a small ring behind the neck so that it hangs down the back. Engolpia come in many different shapes, including oval, rhombus, square, or a double-headed eagle.