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The four-leaf clover is a very rare variation of the common three-leaf clover. According to traditional sayings, such clovers bring good luck, though it is not clear when or how this idea began.
It is claimed that there are approximately 10,000 three-leaf clovers for every four-leaf clover. However, an actual survey of over 5 million clovers found the real frequency to be closer to 5,000 to 1, twice the said probability. Even so, this probability has not deterred collectors who have reached records as high as 160,000 four-leaf clovers in a lifetime.