A thin missile is a type of guided missile that is designed to be aerodynamically efficient and lightweight. It is typically used for long-range precision strikes and has a range of up to several thousand kilometers. The term 'thin missile' is derived from the fact that it is much thinner than other types of missiles, allowing it to fly faster and farther. The term 'ARROW' is often used to refer to this type of missile due to its shape and speed.