Which was quite a lark, because the OG Gameboy only had one speaker and was only stereo if you plugged in headphones.
Ditto with the Mark 1 Sega Genesis. The fact that it could only output stereo via its headphone jack, and not the RCA or RF outputs, did not stop Sega from advertising "stereo" as bold as brass on the box.
Technically, anything that is a matrix of dots is dot matrix.... You could say that all modern displays are dot matrix, since the picture elements, or pixels, are comprised of dots.... They're now colored dots and we normally call them pixels, but they can also be seen as dots, and they're in a matrix, so .......
I'm sure there's plenty of uses for the term. I have no idea what they could be though.