佛陀用以自称的一个称号，注释书对其提出八种或更多解释而莫衷一是，此词早于佛教已存在，且不限于佛陀，任何阿罗汉皆可用之。

An epithet the Buddha used of himself, on which the commentaries offer eight or more explanations without settled agreement, noting the term predates Buddhism and can apply to any Arahant, not only a Buddha.