The Noran Tuk was the period of a Cardassian's life in which he entered adulthood. In 2371 in the mirror universe, Andrul Taqut thought his father's reasoning behind a trip to Betazed, that Andrul had entered the Noran Tuk, was a lie because the Noran Tuk was usually a time for formal galas. (TNG - Mirror Universe short story: "The Sacred Chalice")