From The Free On-line Dictionary of Computing (19 January 2023):
ESP
1. Extra Simple Pascal. Subset of Pascal.
2. Econometric Software Package. Statistical analysis of time
series. "Econometric Software Package, User's Manual",
J.P. Cooper, Graduate School of Business, U Chicago. Sammet
1978.
3. Extended Self-containing Prolog.
4. An early symbolic mathematics system.
[A. Rom, Celest Mech 3:331-345 (1971)].
(1994-12-08)