If you see a piece of alumina or ceramic and it has markings on top with a coupler's model number you'll assume that's what it is.
Perfect man-in-the-middle opportunity
It is a single component, but it is assembled out of several pieces and has 6 pins.
Think of it as an ultra small pcb that you can customize.
While it's not security focused, it gives a really good perspective on how stuff gets built in china.
That's not a component you'd normally find on a motherboard. Finding it would be very suspicious.
There's lots of stuff on a motherboard. many of them are much larger and easier to hide inside or in place of.