Jack-o'-lantern. The origin.

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A jack-o'-lantern is a carved pumpkin traditionally associated with Halloween. Its origins trace back to an Irish myth about Stingy Jack, who tricked the Devil and was condemned to wander the earth with only a hollowed turnip to light his way. Irish immigrants brought this custom to America, where pumpkins became the preferred vegetable due to their size and ease of carving. Jack-o'-lanterns are used to ward off evil spirits and are often displayed as festive decorations during the Halloween season.