Level 2 planet

From Tardis Wiki, the free Doctor Who reference

A Level 2 planet was a designation used by Galactic Law in reference to certain worlds, with the implication that it referred to relatively primitive planets.

Known Level 2 Planets

Behind the scenes

Romana stated that Bartholomew's Planetary Gazetteer noted that the planet Ribos had a protected Class 3 society. (TV: The Ribos Operation) As Ribos was a medieval-era planet, it is entirely possible that Class 3 societies exist of Type 2 planets.