It's just a small pin that every new member of the Diplomatic Council is presented with. But in its message, the pin with the letters "DC" for Diplomatic Council is huge.
The little "DC" marks membership in a global think tank whose members are deeply committed to the principles of humanism. Those who wear the symbol belong to a select circle of bright minds around the globe who care about their fellow human beings and feel a responsibility for the future of humanity. So it is only a small pin for one person, but a great symbol of humanity.