The Sanskrit term for the concept of 'not self' or 'no fixed self'. This is classified among the three marks of existence, namely impermanence, suffering and no fixed self. The equivalent Pali term is Anatta.

In Buddhism, the term anattā (Pali) or anātman (Sanskrit) refers to the perception of "not-self", recommended as one of the seven beneficial perceptions, which along with the perception of dukkha and impermanence is also formally classified among the three marks of existence.