Avici hell; the most painful of the eight hells
Buddhist term for the eighth and most severe hell, where suffering is uninterrupted.
In Buddhism, Avici hell is considered the hell of greatest suffering.
地獄 is the general term for hell or any hell realm, while 阿鼻地獄 specifically refers to the deepest, most painful hell in Buddhist cosmology.
From the Sanskrit 'Avīci', meaning 'without waves' or 'uninterrupted', referring to the continuous suffering in this hell. The kanji 阿鼻 are phonetic (ateji) for 'abi', and 地獄 means 'hell'.