I've never looked at images like this before. Really cool. I don't know the nomenclature, but one question I have is, why are the points where metal contacts touch the IC so... complicated? For example:
Those are output driver transistors. There's a pull-up transistor on one side of the pad and a pull-down transistor on the other. The transistors are interdigitated to make them large so they can provide high currents.
There's a lot going on this AMD IC where the metal leads make contact with it. Not really sure what they are, just a bunch of wavy lines, maybe: https://siliconpr0n.org/map/amd/d87c51/mz_mit20x/#x=5299&y=1...
Btw, I think it's really cool how the URL changes depending on what part of the image is zoomed in on.