There's been a request here Automatically backing up uploaded files? as a comment to create svn, subversion and git tags as synonyms of version-control.
I'm personally not sure this is a great idea - but perhaps it should be up for discussion as I'm guessing that a fair few version control questions might be better suited on Stack Overflow?
On the other hand, the proposed synonyms don't actually exists as current tags, so they may not be missed...
Tag synonyms are created when there are users who keep using two different tags for the same purpose. If users keep using d7, and dr7 to mean the question is about Drupal 7, then those tags would be made synonym of 7.
In the specific case, git is not a synonym of version-control, as the tags have different meanings.
Tags are not created before they are used; there must be a question using them. Users with a reputation of at least 300 can add new tags to their own questions, while users with a reputation of at least 500 can retag questions.
Keep in mind that tags used from only a question are automatically removed after a month.
Bad idea. Take the question When is using --package-handler=git_drupalorg appropriate with drush? This is specifically about drush and some of it's built in git features, not about drush and general version control.
As the person asking the linked question this meta question stems from, I think I'm agreeing with Chapabu and MPD that it's a bad idea to make git and subversion synonymous with version-control.
That said, I think there is a need for VCS-related tags (Instead of just pushing those questions to SO) given Drupal-specific uses of them -- for instance, my question ultimately is asking for a way to hook up an Image field to some sort of VCS. The point MPD is making about drush's use of VCS is another -- I confused myself hardcore just the other day when trying to update a site using Drush because Drush didn't like my working copy.
So, in short:
(That said, I think it's safe to not add tags for any VCS that isn't supported by Drush.)
