Also known as Datura, a children's toy, is slightly like a conch, mostly made of wood, with an iron tip below. When playing, wrap it with a rope and pull it hard to make it rotate upright. Some are made of iron and rotate by the elasticity of the spring. Traditional ancient gyroscopes are roughly inverted cones made of wood or iron, and modern ones have various materials and shapes. Gyroscope is a toy that teenagers are very familiar with.