This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. If an article link referred you here, you might want to go back and fix it to point directly to the intended page.
The Neutrinos are a race of extra-dimensional humanoid aliens from Dimension X and friends of the Turtles. These characters were invented for the 1987 animated series and first appeared in the episode "Hot Rodding Teenagers from Dimension X". They're easily identified by their pointy ears and crazy hairstyles.
Neutrino may also be the name of their homeworld.