BTW

• Sticky-note initialism
• "Read this"
• "Just so you know," in a text
• Letters at the top of an interoffice memo
• "In case it's of interest ..."
• "Here are the facts," briefly
• Start of some memos
• "Just like to mention this," initially

Wikipedia Word definitions in Wikipedia
FYI is an abbreviation of "for your information". FYI may also refer to: