A bit of internet trivia is the oz.au domain. In the late 1980s, the Australian universities were connected in a network with names ending .oz.
When the TLD .au arrived, .oz was renamed .oz.au. So my email address at Elec Engineering at Melbourne University was <name>@ee.mu.oz.au.
And then a few years later, the third-level structure got formalised. Melbourne Uni, for instance, switched from mu.oz.au to unimelb.edu.au.
I for one missed the typographic economy of the ee.mu.oz.au domain.
None of this really matters, of course, except that a sensibly designed structure with a clear underlying rationale, and historical context for a small number of exceptions, makes everything easier to understand :)
Yeah, those old *.mu.oz.au subdomains seem to have steadily disappeared. When my eldest brother was there somewhere around 2005–2010 Computer Science were still actively using cs.mu.oz.au (I think all their email and web stuff was still there), but even that seems to have lost its A records now, though it’s still got a third, interesting NS record (compared to ee.mu.oz.au which has only two boring NS records, edns-*.unimelb.net.au), mulga.cs.mu.oz.au, which is still talking A.
Another bit of historical trivia that now becomes mundane: csiro.au.
When the TLD .au arrived, .oz was renamed .oz.au. So my email address at Elec Engineering at Melbourne University was <name>@ee.mu.oz.au.
And then a few years later, the third-level structure got formalised. Melbourne Uni, for instance, switched from mu.oz.au to unimelb.edu.au.
I for one missed the typographic economy of the ee.mu.oz.au domain.
None of this really matters, of course, except that a sensibly designed structure with a clear underlying rationale, and historical context for a small number of exceptions, makes everything easier to understand :)