From time to time we get a question that hinges on what is a term-of-art for some profession or craft. For instance, right now we have this fine question concerning an odd turn of phrase in medical research.
StackExchange's tag system has an interesting property which might help us support this sort of advanced ELL question better. If we had tags for common specialty domains – medicine, law, programming/comp sci, and athletics/sports all leap to mind – people with specialist knowledge of English usage in those domains could subscribe to those tags. I would be happy to subscribe to "jargon-medicine" (or even better "jargon-medicine-psychiatry") and get alerts emailed to me for the occasional question to which my expertise pertains, which otherwise I would be likely to miss because I don't have a lot of opportunity to check in here daily.
Basically, we could be using the tags as a kind of Bat Signal to make sure that questions that need specialist attention come to the attention of specialists.
I'm not sure "jargon" is the right term, since I don't mean it only to include "jargon terms". One of the things interesting about the example question I cite above is that it's about an idiosyncratic word being used in a medical context that isn't medical jargon, but it may be being employed because all the obvious alternatives are terms-of-art in medical research, that don't pertain to what the authors meant. I imagine there might be things about grammar and style, too, that are profession/domain-specific.
I'm not sure what the right term would be though.
Edited to add: We just got a question about verb tense in programming, a fabulous example of a non-terminology question about professional/specialty English language use.