The Finnish New Year's Eve practice of predicting the future by casting molten tin is called molybdomancy.
In the tradition, a small piece of tin is melted and poured into cold water. The resulting solid shape, or the shadow it casts, is interpreted as a sign about the coming year. Finnish New Year's fortune-telling has often used shapes resembling objects such as ships, hearts, or animals as prompts for predictions.
The term molybdomancy comes from Greek words associated with lead and divination, although modern Finnish practice has commonly used tin or tin-based material. Concerns about lead exposure led Finland to restrict or replace traditional lead-containing fortune-telling products. This custom is different from pyromancy, which refers broadly to divination by fire, and from chiromancy, which means palm reading.