The word "囚笼" is formed by combining the character "囚", which pictographically represents a person enclosed within boundaries, denoting imprisonment or a prisoner, with the character "笼", which incorporates a bamboo radical to indicate material and a phonetic component for sound, meaning cage. Together, they create a compound where the first character specifies the purpose (confinement) and the second specifies the object (a cage), resulting in the meaning of a prison cage or confinement cage.