Acronym - Wikipedia
https://en.wikipedia.org/wiki/Acronym
An acronym is a word or name formed from the initial components of a longer name or phrase. Acronyms are usually formed from the initial letters of words, as in NATO (North Atlantic Treaty Organization), but sometimes use syllables, as in Benelux (short for Belgium, the Netherlands, and Luxembourg). They can also be a mixture, as in radar (RAdio Detection And Ranging). Acronyms can be pronounced as words, like NASA and UNESCO; as individual letters, like FBI, TNT, …
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