Teacher's Day (Islamic Republic), death of Morteza Motahhari, Ordibehesht 12. This date marks the anniversary of the assassination of Morteza Motahhari, an Iranian university professor and theorist, in 1979. Following his death in Tehran on this day, the date was designated as Teacher's Day in the Islamic Republic, reflecting the impact of this event on the country's educational and cultural environment. Today, Ordibehesht 12 is observed annually as Teacher's Day, with ceremonies held in schools and universities to recognize the contributions of teachers. The occasion serves as a reminder of the role of educators in society and highlights the importance of education in Iran. On this day, students and university attendees often present flowers and messages of appreciation to teachers. Special cultural and educational programs are organized nationwide to emphasize the significance of teachers and education in the community. According to Islamic Republic sources, this observance is registered and presented in the official calendar in this form and with these descriptions.