What is a well-known symbol of St. Patrick's Day?

The shamrock is widely recognized as a symbol of St. Patrick's Day, deeply rooted in Irish culture and history. Traditionally, it is believed that St. Patrick, the patron saint of Ireland, used the shamrock to explain the concept of the Holy Trinity—Father, Son, and Holy Spirit—representing the three persons in one God. This association gives the shamrock not only cultural significance but also religious importance. It showcases the connection between Irish identity and the celebration of St. Patrick's Day, making it a fitting emblem for festivities that honor Irish heritage. Additionally, the shamrock's green color links it to spring and renewal, further enhancing its symbolic value during this holiday dedicated to celebrating Irish culture.