Post-it initialism

• "This might be of interest," on a memo
• Murphy Brown's fictional program
• "Just so you know ...," in memo shorthand
• "Just saying" letters
• "Just wanted to pass this along," on memos
• Memo-header notation
• Heads-up letters
• "Just a heads-up," to a texter
• In case this is of interest...

Wikipedia Word definitions in Wikipedia
FYI is a common abbreviation of " for your information ". "FYI" is commonly used in e-mail, instant as on messaging or memo and messages, typically in the message subject, to flag the message as an informational message, with the intent to communicate to ...