The term "naijin" refers to a place where a honzon (a principal image of Buddha) is enshrined inside the hondo (main hall) of a temple, or where a shintai (an object of worship housed in a Shinto shrine and believed to contain the spirit of a deity) is enshrined inside the honden (main hall) of a shrine.
内陣（ないじん）は、寺院の本堂内部において本尊を、神社の本殿内部において神体を安置する場所。