Kirindilyin is one of the Murinbata names — alongside Ngamur and Kulaitj — for the darkest band of the rainbow, recorded by W. E. H. Stanner in his account of the Rainbow Serpent at Port Keats. Where the brightest, blood-red band is identified with Kunmanggur, the dark band is conceived as a distinct, female being, represented as a black snake living in the sea. In some tellings she was reckoned older (kulaitj) than Kunmanggur and to have been married before she became his partner. She thus forms the sombre, feminine counterpart to the male Rainbow Serpent within the single phenomenon of the rainbow, and is the least elaborated of the named rainbow-beings in Stanner's record.