In the theatre jargon of those days, I wanted to play Rajapart which was the role of a King. I appealed to my teacher demonstrating to him my prowess at playing this role. Gradually the number of female roles that came to me lessened and I was given male roles, and finally, I reached the status of a Rajapart actor. I was considered one of the most important actors in the troupe. (Sivaji Ganesan, Autobiography of an Actor, ed. by T. S. Narayana Swamy. Translated English edition, Chennai 2007)Elsewhere in the text, Ganesan introduces the following terms, which illustrate the eccentric manner in which Tamil speakers tend to adopt English words.
Iron Streepart means a very important female part and similarly Iron Rajapart means a very important male role.Why iron? I've been scratching my head, but the best I've got is this equation: iron=something strong=something very important. Maybe someone out there has a better explanation?