The Enneagram of Personality, or simply the Enneagram (from the Greek words ἐννέα [ennea, meaning "nine"] and γράμμα [gramma, meaning something "written" or "drawn"]), is a model of human personality which is principally understood and taught as a typology of nine interconnected personality types. Although the origins and history of many of the ideas and theories associated with the Enneagram of Personality are a matter of dispute, contemporary Enneagram understandings are principally derived from the teachings of Oscar Ichazo and Claudio Naranjo. Naranjo's theories were partly influenced by some earlier teachings of G. I. Gurdjieff. As a typology the Enneagram defines nine personality types (sometimes referred to as "enneatypes"), which are represented by the points of a geometric figure called an enneagram, which, it is believed, also indicate some of the connections between the types. There are different schools of thought among Enneagram teachers, therefore their ideas on some theoretical aspects are not always in agreement.