At least that was my impression of it all.
In a way, I used it as inspiration to create these 61 items for my game. There are eight items per category with the exception of special rare equipment, tentatively sorted in ascending order of power. Each human can equip one on the left panel, plus one on the right.
I need a few junk items too, so I suppose the total will be bumped up to a nice and even 64, power of two.