titular bishop
bishop who is not in charge of a diocese, such as coadjutor bishops, auxiliary bishops, bishops emeriti, vicars apostolic, nuncios, superiors of departments in the Roman Curia, and cardinal bishops of suburbicarian dioceses
en-US/ˈtɪt͡ʃəlɚ ˈbɪʃəp/
en-GB/ˈtɪtjʊlə ˈbɪʃəp/