A tag for it was created today: https://security.stackexchange.com/posts/34355/revisions
2fa not very clear. It's that it was in the question's title or I wouldn't have understood at first. Should we change this to the (rather long) two-factor-authentication? Or perhaps multi-factor authentication (regardless of two or three)?
And I haven't looked yet, but more posts might need this tag. If I were to tag some posts as 2fa now and we then change (or alias) the name of the tag, I assume all posts will be changed with it?
Edit: Oh, actually, there is a tag. That would make
2fa obsolete anyway: https://security.stackexchange.com/questions/tagged/multi-factor
I suppose this topic can be closed; I'll retag the post.