They use this style guide: https://www.theguardian.com/guardian-observer-style-guide-a https://www.theguardian.com/guardian-observer-style-guide-a Initialisms

They use this style guide: https://www.theguardian.com/guardian-observer-style-guide-a https://www.theguardian.com/guardian-observer-style-guide-a Initialisms are capitalized, while acronyms are not.