Don't go onto Amazon and order a random cheap ac adapter for any console that you have. They create a bunch of noise on the screen and it leaves a trail of flickering pixels going up the screen.
Certification marks are just extra silkscreen printing applied at the factory in China. In my field I've seen plenty of melted UL marked relays that were clearly cheap clones of the original.
If you're buying a 5 dollar adapter off Amazon and it has those marks, you can pretty much assume that they mean nothing.