Recently I've come across the tag "generalization", see here. It's relatively new and there is only one question (Edit: now removed) under it. However, I don't think it's that useful, taking into consideration there isn't any mathematical content associated with it. On the other hand, it's quite vague whether or not a question should be tagged "generalization", maybe when we spot the phrase "in general" or "more generally"? I would like to know the community's opinion on this. Thanks in advance.