I recently edited the "multivariate-calculus" tag, and described it as follows:
For questions about teaching calculus with functions of more than one variable (also perhaps known as "Vector calculus" or "Calculus 3").
I now see there is a "vector-calculus" tag. They're both infrequently-used for now (one question under multivariate, two under vector), but I'm sure they'll be more popular in the future. So, I thought it helpful to bring this up now. I will post my proposed "solution" below.
Consider upvoting this post to be promoting the discussion, and upvoting an answer to be supporting that viewpoint.