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It used to be BRIC (Brazil, India, China, Russia) or BRICS (same + South Africa). In the article, it has been extended again to other nations, therefore “so-called” because its membership is not the same anymore. Also, the membership seems very informal, it’s just a bunch of countries maintaining ties and having discussions, not a real group of countries, with its own set of rules and institutions.
That makes a lot more sense. Appreciated.