The term 'Punishing Rod' can be summarized by two crossword solutions: FERULE (6 letters) and FERULE of Conduct (15 letters). A FERULE is a short rod or stick used to punish children, usually made of wood or metal. The FERULE of Conduct is a set of rules or regulations that must be followed in order to avoid punishment. It is often used in schools and other educational institutions to ensure that students adhere to the rules.