Originated in ancient Greece. According to relevant public information, the shoulder patting ceremony in Greece is an ancient tradition, which originated in ancient Greece and was a ceremony to protect the captured during the armistice. Clapping on the shoulder means that the arrested person can be trusted and cannot be attacked or hurt. This ceremony is also believed to calm the captured people's emotions and make them feel safe and protected. In modern Greece and Cyprus, this is still an informal etiquette, which shows trust and friendliness and is often used in social occasions.