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The Free On-line Dictionary of Computing (foldoc)

1. {Scheme Object System}.

2. An infamously {losing} text editor. Once, back in the
1960s, when a text editor was needed for the {PDP-6}, a hacker
{crufted} together a {quick-and-dirty} "stopgap editor" to be
used until a better one was written. Unfortunately, the old
one was never really discarded when new ones (in particular,
{TECO}) came along. SOS is a descendant ("Son of Stopgap") of
that editor, and many {PDP-10} users gained the dubious
pleasure of its acquaintance. Since then other programs
similar in style to SOS have been written, notably the early
font editor BILOS /bye'lohs/, the Brother-In-Law Of Stopgap
(the alternate expansion "Bastard Issue, Loins of Stopgap" has
been proposed).

3. The {PDP-10} instruction to decrease a value. Oppose
{AOS}.

[{Jargon File}]