A History of Short Words

From the New York Times Crossword Puzzle

SSNS

Sun, 8 May '22
1040 figs.
Wed, 19 Jan '22
Info collected by H.R.
Fri, 7 Jan '22
Figs. assigned randomly since 2011
Mon, 26 Jul '21
Tax IDs
Sun, 20 Jun '21
Application figs.
Thu, 17 Jun '21
Info on tax forms
Sun, 23 May '21
Credit application figs.
Tue, 16 Mar '21
Some I.R.S. data, in brief