Title for a being meaning roughly 'The Great One Who Is Not To Be Named' and the source of Hastur's epithet of The Unspeakable. The title derives from the Classical concept of not calling upon certain gods by name as their duties were so important to the upkeep of the world that distracting them had the potential to cause terrible disasters (later modified in the case of Hastur to imply that attracting his attention would bring disaster upon the one calling upon him).