Korea has a rich history of innovation, contributing several notable inventions to the world. One of the most famous is the Korean alphabet, known as Hangul, created in the 15th century to improve literacy among the common people. Additionally, the invention of the rain gauge during the Goryeo Dynasty helped in agricultural planning by measuring rainfall accurately. Another significant invention is the turtle ship, developed in the 16th century by Admiral Yi Sun-sin. This armored warship played a crucial role in naval battles against Japanese invasions. Furthermore, Korea is known for advancements in technology, including the development of LED lighting and smartphone technology.