Use ～と称する in written or formal spoken Japanese when reporting what someone calls themselves or their product, especially when you want to stay neutral—or signal quiet skepticism—about whether the label is deserved. It is standard in news copy, compliance notices, audit reports and internal memos where 「～と言っている」 would sound too casual. The ～と称して form is especially common, meaning “under the guise of / on the pretext of.”