This would be for questions/answers that fall into the category of generally useful references. canon
Let's compile a list of canonical Q&As is the current example that comes to mind, but I'm sure there are others. We really should be more systematically creating a list of canonical questions/answers and referring people to it. I had to spend some time searching for it just now. If it was permanently globally visible in meta, that would be helpful.
ADDENDUM: Should this be put on Stack Exchange Meta?