A class of devas, living in the highest of the five Suddhāvasā (Pure Abodes). DN.iii.237
In the Mahāpadāna Sutta DN.ii.52f. the Buddha mentions that he visited their abode and conversed with beings who were born there as a result of the holy lives they had lived under various Buddhas.
In the Sakkapañha Sutta. DN.ii.286 Sakka speaks of them as the highest devas, and expresses his satisfaction that he, too, will be born among them in his last life.