In planetary classification Class L is a category of planet, only marginally habitable by humanoid life. However, such planets are capable of supporting humanoid colonization. (ST reference: Star Charts) As a result of "the Pulse", planet Mestiko was reclassified from Class M to Class L. (TOS - Mere Anarchy eBook: The Centre Cannot Hold) As of 2370 the Cardassians maintained a colony on a class L world in the Xoxa system. (DS9 novel: Devil in the Sky)