short name for Chahar Province 察哈爾|察哈尔[Cha2 ha1 er3]
Phonosemantic compound. 宀 represents the meaning and 祭 represents the sound. Based on the original meaning "eaves". The meaning later shifted to "observe from above", "examine", and "inspect".
《說文》：“察，覆也。从宀、祭。”
eaves