Today I find the tag deleted, possibly because
cubature is also the name of a specific package I used in the example. I wonder, what's wrong with adding a tag to SO that corresponds to a technical term with general use?
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I deleted it because it was only on that one question. Typically if you want to justify a new tag, verify that other questions are on the same topic to see how localized it is. If you see a usage pattern that seems justifiable, add the tag to those other questions in addition to yours.
There are currently five questions that mention cubature. Three of them are recent, but it's certainly a low-use concept for a tag.
Tags are for searching and filtering. Can you imagine 100 questions on that tag coming anytime soon? If not, don't make it. Think how many people will want to follow questions tagged cubature. It seems a rather obscure package, so I doubt many people will need the tag. So it is too localised.