Recently the tag venn-diagram was created, with a tag wiki, and currently 20 questions tagged (although 19 of which were tagged by the creator shortly after).
Do we really need this tag?
On the one hand, it is going to be helpful in filtering questions which are specifically about Venn diagrams, for better and for worse. And while most of these are questions about [very elementary] set theory, some of them are not (e.g. "can you draw a Venn diagram in such and such way").
On the other hand, searching for questions about Venn diagrams is fairly easy, as they all pretty much contain the phrase "Venn diagram". And the striking majority of these are already tagged under elementary-set-theory or discrete-mathematics.
So is this tag worth saving?