Basically how reddit would call any given reddit sub-community “sub reddit” or just “sub” for short. I know internally lemmy just calls them ‘community’ but in a regular conversation ‘community’ might be interpreted as more broad or too general.
Thinking about it my mind would pretty much automatically go to ‘sub lemmy’, but then I felt like just shortening it to ‘blemmy’ has a great ring to it, while still being distinct. So if there isn’t already an established name, I’ll go ahead and propose ‘blemmy’.
You are overcomplicsting this. If we said “reddit forum” before, that’s just as understandable as “Lemmy forum”.
And if someone knows what “subreddit” is then they are necessarily already aware of Reddit, so why wouldn’t the same assumption apply to Lemmings, too?