Four Leaf Clovers are widely regarded as symbolic of St. Patrick's Day...in America. The true symbol of the holiday is the 3 leaf clover, according to newsy.com. The 3 leaf clover represents the holy trinity. St. Patrick wasn't Irish. He is however, credited with bringing Catholicism to the Emerald Isle. The 4 leaf clover is actually very rare. That's why it's regarded as lucky. We Americans love to celebrate the day with Irish whiskey, and green beer. Popular culture is rife with jokes about drunken Irishmen. Would you believe drinking alcohol on St. Patrick's Day was illegal in Ireland 'til the 1970s?...