I don't know the proper name for it, but I always called it the "POS".
There was no fan inside and the only ventilation came through those small holes on the back. The heat inside had no where to go. You could fry an egg on this thing.
It was also weak, slow and overpriced.
I would nominate an early eMachine that my dad made the mistake of buying.
The worst TWO design flaws I ever saw were in the same machine, a Fujitsu PC I used when I was in Japan. First, the keys were so loose that if you hit them at the slightest angle away from the exact perpendicular, they'd bind and not go down. Touch typing was impossible. The worst flaw, however, was that if you slid the keyboard back until it hit the system box, it would actually press the power button and turn the machine off. Many a graduate student learned the hard way to use that keyboard only when it was on his lap.