.Fyi, meaning "for your information," is an example of a acronym
We use the article "an" because the letter F has a vowel sound at the beginning. As a reminder, For Your Information, or simply FYI, is usually pronounced as a single word. We use the article a because the letter F starts with a vowel sound.
Even in professional communication, the phrase "fyi" is frequently used to imply that a message or a portion of a message is intended just for informational purposes and doesn't call for any specific action. Fyi is a common email subject because of this.
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