The word "寥廓" is formed by combining two characters: "寥" is composed of the radical "宀" (roof) and the phonetic component "翏", which suggests pronunciation and conveys emptiness or height; "廓" is composed of the radical "广" (expanse) and the phonetic component "郭", which suggests pronunciation and conveys expansion or breadth. Together, they semantically emphasize vastness, specifically referring to boundless skies or open spaces.