Avaivartika­cakra­nirghoṣā (Sound of the Wheel of Nonregression) is a buddhafield inhabited by the Buddha Suniścita­padma­phullitagātra. “Nonregression” (Skt. avaivartika, Tib. phyir mi ldog pa) refers to a stage on the bodhisattva path where the practitioner will never turn back, or be turned back, from progress toward the full awakening of a buddha.