The term "unicorn horn" refers to the mythical horn that is said to protrude from the forehead of a unicorn, a legendary horse-like creature often depicted in folklore and fantasy. This horn is typically described as spiraled and is believed to possess magical properties, such as healing abilities and the power to purify water. In historical contexts, the unicorn horn was often associated with real animal horns, particularly those from narwhals, which were sometimes sold as unicorn horns in medieval markets. These horns were highly valued and thought to be antidotes to poisons, showcasing the blend of myth and reality in ancient beliefs.