The term "jiao" (horn) refers to a hard, pointed structure that protrudes from the heads of various animals, including cattle, goats, and deer. Horns are made of keratin, the same protein that forms human hair and nails. They serve multiple purposes, such as defense against predators, competition for mates, and social signaling among species. In many cultures, horns have symbolic meanings and are used in traditional practices. For example, in some regions, horns are crafted into musical instruments or used in rituals. Additionally, they can be a source of materials for art and decoration, showcasing their cultural significance beyond their biological functions.