ISSR meaning in International ?

Pi Gamma Mu or ΠΓΜ (from Πολιτικές Γνώσεως Μάθεται) is the oldest and preeminent honor society in the social sciences. It is also the only interdisciplinary social science honor society. It serves the various social science disciplines which seek to understand and explain human behavior and social relationships as well as their concomitant problems and issues. Pi Gamma Mu's constitution defines the social sciences to include the disciplines of history, political science, sociology, anthropology, economics, psychology, international relations, criminal justice, social work, social philosophy, history of education, and human geography. Membership is also extended to interdisciplinary social science fields that build on the core social science disciplines, such as business administration, education, cultural and area studies, public administration, and organizational behavior.

The mission of Pi Gamma Mu is to encourage and recognize superior scholarship in social science disciplines and to foster cooperation and social service among its members.