Nanites are the Earthlings who live on the Magreathean-made planet Nano. The Nanites were brought to Nano by Zaphod Beeblebrox and have an enemy tribe brought to the planet (also by Zaphod) called the Tyromancers.
The Nanites went to battle with the Tyromancers in golf carts, where the trainers attacked an important figure.
The Nanites appeared in:
Nanite is an accepted sci-fi term for microscopic robots which generally clean and repair larger systems, sometimes including humans and other living organisms.