Symbolic Stream Generator
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The Symbolic Stream Generator (or SSG) is a software productivity aid by Unisys for their mainframe computers of the former UNIVAC 1100/2200 series.
SSG is used to generate RUN-Streams (corresponding to IBM's Job Control Language), apply and administer symbolic changes to program sources as a form of version control, and for many other purposes.
An SSG program (i.e., its "job control script") is called a Skeleton, and its programming language Symstream.