SOS
= S =
source of all good bits
source n.
[very common] In reference to software,
`source' is invariably shorthand for `source code', the
preferred human-readable and human-modifiable form of the program.
This is as opposed to object code, the derived binary executable
form of a program. This shorthand readily takes derivative forms;
one may speak of "the sources of a system" or of "having source".
--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.