A visual trope in science fiction materials: humanoid robots that look skeletal in design. They all have relatively thin limbs that are reminiscent of bones, and they usually lack "filling" in places where humans have only soft organs, like the abdomen. Such robots can be very obvious, with sinister, grinning skull-faces, a la the T-800 from The Terminator. Others are more subtle, often with fairly realistic faces. Some, such as the T-800s, are designed to be covered with "something", so they literally are robot skeletons. Examples of Skele-Bot 9000 include: