shamrock

/ˈʃæmrɑk/
noun
  1. A small clover-like plant with three leaves, often used as a symbol of Ireland.
    • Many people associate the shamrock with Irish heritage and good luck.
    • She wore a green dress with a shamrock pin for St. Patrick's Day.
    • The field was covered in shamrocks, their bright green leaves shining in the sun.