The Free On-line Dictionary of Computing (30 December 2018):

Lotus 1-2-3
1-2-3

    A spreadsheet for MS-DOS from Lotus
   Development Corporation.  It can be programmed using
   "macros" and comes with a separate program to produce graphs
   and charts but this cannot be run at the same time as the
   spreadsheet.  It has keyboard-driven pop-up menus as well as
   one-key commands, making it fast to operate.  Lotus 1-2-3
   supported EGA and later VGA graphics.  Early versions used
   the filename extension "WK1".

   Version: 4.

   Lotus 1-2-3 has been the subject of several user interface
   copyright court cases in the US.

   (http://nyweb.com/lotus/123.html).

   1-2-3's successor, Symphony, had simultaneous update of
   spreadsheet, graph and word processor windows.

   (1995-11-28)