A History of Short Words

From the New York Times Crossword Puzzle

FYI

Mon, 18 Mar '24
"Just a heads-up …"
Wed, 26 Jul '23
Memo starter
Wed, 31 May '23
Post-it note abbr.
Sun, 24 Jul '22
Memo opener, often
Wed, 23 Feb '22
Letters accompanying a tip
Thu, 20 May '21
"In case it's of interest ..."