Shamrock or Four Leaf Clover is a good luck symbol.
Are You Superstitious?
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Everyone Knows About Four-Leaf Clover Superstitions
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Friday the 13th – Are Superstitions a Crutch or a Help? - Memorial Health Blog - Memorial Health Blog
Four Leaf Clover Folklore Meaning St Patrick Day 2018
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Superstitions in Ireland - a light-hearted look at bad omens — Suzanne Winterly
Irish folklore: Good and bad luck signs to watch out for
Superstitions, Folklore, Myths & Legends - The Origins, History & Facts of Popular Wives' Tales: 9781922531421: Matthews, Scott: Books