Are there any other accronyms which became a language construct like "OK"?
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I was actually just talking to my wife about how fascinating it is that the word OK (okay) has probably only existed for less than 200 years, yet it is arguably the most widely used word in the world.
Unfortunately, I can't think of any other acronyms that have become such an integral part of the English language. They usually just become nouns like "scuba" or "radar."
I recommend the book "Word Myths: Debunking Linguistic Urban Legends" for some pretty comprehensive research on the origins of OK as well as other words or phrases that have origin stories that are too good to be true.