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FYI is an acronym for "For your information." So, instead of writing "For your information" you would simply write "FYI" to get your point across. (Hence, an acronym) An e-mail may be forwarded and in the content you can write "FYI" and the reader should then scroll down to read the remainder of the e-mail. Can be mistaken for "For your FYI" - this is misuse of acronym.
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