What is the name of the 3-leaved-clover symbol of Ireland?

This iconic three-leaved clover is deeply intertwined with Irish history and folklore. Its significance is most famously linked to Saint Patrick, the patron saint of Ireland. Legend holds that in the 5th century, St. Patrick used the shamrock's three leaves to visually explain the Christian doctrine of the Holy Trinity—the Father, the Son, and the Holy Spirit—as one entity. This simple yet powerful metaphor is believed to have aided in the conversion of the Irish people to Christianity. The plant's name itself comes from the Irish word "seamróg," which means "young clover."

While strongly associated with St. Patrick, the shamrock's importance may have even earlier roots in Celtic traditions. The number three held mystical significance for the Celts, and the Druids, their priests, may have considered the clover a sacred plant. Over centuries, this connection to both pagan and Christian heritage solidified its place as a national emblem. By the 18th century, the shamrock was widely recognized as a symbol of Ireland, much like the rose for England or the thistle for Scotland. It was adopted by militias and appeared on flags, evolving from a religious emblem to a potent political and cultural icon.

It is important not to confuse the shamrock with the four-leaf clover. The shamrock's identity is tied to its three leaves, representing Irish heritage and faith. The four-leaf clover, a rare variation, is primarily considered a symbol of good luck. Botanically, there isn't one single plant species that is the "true" shamrock; several types of three-leaved clovers, such as Trifolium dubium or Trifolium repens, are accepted as the symbol. Today, the shamrock remains the most recognized symbol of Ireland and is worn with pride on St. Patrick's Day around the world.