<human>:  When did the Nazis start to use the term ‘Aryan’?
<bot>: The Nazis started using the term “Aryan” in the 1930s. The term “Aryan” was used by the Nazis to refer to a group of people who they believed were the most physically and mentally fit. The Nazis believed that the Aryan race was superior to other races, and that they were the only ones with the right to rule the world.