Dogon has been frequently referred to as a single language. In reality, there are at least five distinct groups of dialects. The most ancient dialects being "dyamsay" and "tombo", the former being most frequently used for traditional prayers and ritual chants. The Dogon language family is internally highly diverse, and many varieties are not mutually intelligible, actually amounting to some 12 dialects and 50 sub-dialects. There is also a secret ritual language "sigi sǫ" (language of Sigi), which is taught to dignitaries ("olubarū") of the Society of the Masks during their enthronement at the "Sigui" ceremony. Women have no right to learn "Sigui So".