General Purpose Systems Simulator. Geoffrey Gordon, 1960. Discrete simulations. "The Application of GPSS V to Discrete System Simulation", G. Gordon, P-H 1975. Versions include GPSS II (1963), GPSS III (1965), GPS/360 (1967), and GPSS V (1970).
GPSS
Meaning of GPSS in English
FOLDOC computer English dictionary. Английский словарь по компьютерам FOLDOC. 2012