Medical nanorobot, computer artwork. Nanorobots is a term used to describe future microscopic robots that could have a wide range of uses. The medical uses could include the targeted delivery of drugs. This nanorobot is an injector, containing a yellow liquid that it can inject using its needle tip. It has a propeller-based propulsion system, like that of a submarine, allowing it to move in liquids, such as those found inside the human body.