Here's an abbreviation to avoid, because its various meanings overlap so heavily.

• Source Code Manager: synonym for version control system, e.g. as used by the Linux crowd in the early days of git.
• Software Configuration Manager: usually incorporates version control, build system, archival of build products, and CASE methodology baggage, e.g. ClearCASE and Vesta.
• System Configuration Manager: for system administrators rather than developers, e.g. cfengine and Puppet.