pn (Greek god) The goddess of discord, confusion, and strife, keeper of the golden apple of discord|Apple of Discord which she threw into the wedding of Peleus and Thetis starting the Trojan War; daughter of Nyx, sister and constant companion of Ares, mother of Lethe.
pn (astronomy) The largest known dwarf planet in the Solar System (initially dubbed the "tenth planet"), officially known as 136199 Eris, with one natural satellite, Dysnomia.