The breakthrough was finally made possible by the royal name Vema Takhtu, which appeared in both Bactrian parallel texts, and the title “King of Kings,” which could be identified in the corresponding sections in the unknown Kushan script
it apparently served as one of the official languages of the Kushan Empire alongside Bactrian, Gandhari/Middle Indo-Aryan and Sanskrit. As a preliminary name, the researchers propose the term “Eteo-Tocharian” to describe the newly identified Iranian language.
