"microcomputer" would be a great word for things like the raspberry pi or beaglebone, but it's already taken by regular size computers (because at the time the term microcomputer was made, a minicomputer was the size of a desk, and at the time the term minicomputer was made a computer was the size of a room)
re: I can't tell if I'm making a serious suggestion here
@Felthry yeah, that's the problem