The map we use for identifying personality types is called the Enneagram (pronounced “ANY-a-gram”). The Enneagram diagram consists of a triangle and a hexagon enclosed within a circle. These elements combine to create nine points along the circle (“ennea” is Greek for “nine”; “gram” means “drawing”). In the early 1970s, personality theorists started mapping observations about personality to this diagram. Over time, numerous schools of thought sprang up about this system and it is used by consultants, psychologists, social workers, and educators across the globe.
(Adapted from “Awareness to Action: The Enneagram, Emotional Intelligence, and Change” by Robert Tallon and Mario Sikora)