I find the word 'meta user' in my profile section of English Language & Usage site and 'main user' in meta.english.stackexchange site. What do 'main user' and 'meta user' mean?
Clicking on main user
takes you to your user profile on the main site, while clicking on meta user
takes you to that on the meta site.
Update: main user
has been relabelled as parent user
.
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This does not explain the difference between the two. – user346073 Jun 2 '20 at 0:15