The word "宫殿" is formed by combining two characters, each representing a distinct but related architectural concept. "宫" originally referred to a large, enclosed building or complex of buildings, typically a royal residence. "殿" specifically denotes a grand, towering hall used for important ceremonies and audiences. When fused into the compound "宫殿", the meaning expands to encompass the entire majestic, palatial complex, merging the idea of the residential quarters with that of the formal ceremonial halls to represent the complete imperial palace.