Collins dictionary:
king 3) a) a person, animal, or thing considered as the best or most important of its kind.
also, there are many species of fishes with names like:
king of the herrings
king of the mackerels
king of the mullets
king of the salmons
reef king
sea king, etc.
I think the HUD looks strange because these screens are distorted as hell. The monitor from wich they were taken is probably 16:10, or how they make widescreen monitors today, I don't know.. Here the screens are almost square in proportions and as a result everything is stretched vertically and...
About storytelling in games, story and plot in Fallout: I just wanted to link to an interesting (imho) post at doctorspooky.com, entitled "Designers Vs. Directors": http://www.doctorspooky.com/2008/06/designers-vs-directors.html