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The origin of the gentile "carioca", the nickname given to the inhabitants of Rio de Janeiro, is controversial. One official theory is that the term "kara'iwa" means "white man" and "oka" means "house", thus forming the term "white man's house". However, another theory suggests that the word comes from "akari", used by the Tupinambá Indians to describe a type of fish that had a characteristic similar to the armor of the Portuguese.