Suggested Description: “Array Programming Languages such as Dyalog, APL, and J.”
I would (moderately) prefer the slightly adjusted suggested description: “Array programming languages such as APL, J, and K”.
And would definitely appreciate this tag. Lots more array/vector language stuff to come!
I think maybe “Array languages” or “Array programming” would be a good descriptiveness/briefness tradeoff.
Tag descriptions are even briefer than that. My guess would be “Array programming languages” or “APL, J, K, Q” if you want to list them in the tag instead of making it generic.