I think theyre just trying to get the sequence obvious, which I think it pretty much is?
The 35 is between 3 and 5 in size/capacity. The 5 is before 6, the 8 sits on top of all.
EQ is equatorial, az is alt az. H = heroic
The rest is up to us, I guess.
The azgti definitely has encoders, too... not sure what the e and i stand for on those.