Not a 4-Leaf Clover

A shamrock is a young sprig of clover, used as a symbol of Christianity in Ireland. Saint Patrick, Ireland's patron saint, is said to have used it as a metaphor for the Christian Holy Trinity.^[1] The name shamrock comes from Irish seamróg, which is the diminutive of the Irish word for clover (seamair) and means simply "little clover" or "young clover"
Wikipedia