A History of Short Words

From the New York Times Crossword Puzzle

Words of five or fewer letters since August 15, 2006

ssn

Thu, 14 Dec '06
Tax form ID
Wed, 13 Dec '06
One form of ID
Tue, 14 Nov '06
ID for the I.R.S.
Mon, 4 Sep '06
Nine-digit ID
Sun, 3 Sep '06
Form W-9 datum: Abbr.
Wed, 16 Aug '06
Nine-digit ID