At least on my pavilion, it’s just one simple daughter board for one of the USB ports. It’s the one I use the most. I can replace it easily if it breaks. The pcb is also very simple so it ends up being very cheap.
The square shaped one threw me for a loop the first time I worked in a computer with one.
Very Andersen powerpole esque
Look, I like 1 indices languages like R and Lua.