Another tag with somewhat inconsistent usage is duality. It seems to be quite often used for duals in functional analysis and linear algebra.

Would it perhaps be better to introduce new tag dual-spaces?

On math.SE that dual-spaces tag was created in April and it already has 74 questions. (I did not notice any objections against that tag.)

@ToddTrimble Maybe a post on meta concerning the tags mentioned above would be right thing to do? Would "Help improve tagging!" be the right place where to post the suggestion to create the dual-spaces tag?

Maybe covering would deserve a separate question? (Since there are several possible options what to do with that tag.) If we post about this tag on meta, would you or François G. Dorais consider posting the question? (After all, you both have much more experience with tags on MO than I do.)

@MartinSleziak Sure, I'd consider that. Although I reject the assertion I know more about tagging than you do. :-)

I appreciate that you're saying that. And it is possible that I might know a few things about some workings of SE network which are less known. But you definitely have more experience here on MO.

Anyway, I'll try to post a suggestion about (dual-spaces) in "Help improve tagging!".

Tags that are single adjectives are best avoided, even if they are also perfectly legitimate nouns. covering is an example of this. As an adjective this is just another meta-tag (of the more harmless variety). Using the plural form coverings or perhaps better covers is better.

I also like packing-and-covering since the conjunction virtually eliminates the meta-tag usage, but packing-problems and covering-problems are probably better choices.

My personal preference would be to split covering between covering-spaces and packings-and-coverings (note the plurals).

As there are several possible choices, I suggested above that perhaps there could be a separate questions about covering tag rather than just posting a new naswer in some of the long thread.

But I will certainly leave that up to you two.