This is a plant with four heart-shaped green leaves, called a four-leaf clover. It belongs to a type of clover, but there is only one four-leaf clover in an average of 10,000 clovers. It generally refers to the four-leaf clover plant itself, which is more used to indicate super luck. Both it and
π (clover) can indicate luck, but four-leaf clover is rarer and luckier than π.