Non-Self

Non-Self is a broad metaphysical stance that there's no such thing as 'Self' or 'I' as an independent and/or unchanging existing object.

Non-Self in Buddhism
Buddhism advocates that there is no self as a both unchanging and independent object, in contrast to Brahmanism. In Buddhism, the self is not unique as it is just a composition of Skandhas just like any other things, and since there's nothing unchanging in the univserse, so does the self.

Non-Self in Idealism
David Hume argued that there is no self as an unchanging subject, as the self is just a mere collection of constantly changing thoughts and emotions.

Non-Self as the Unique
Max Stirner argued that since the unique is inherently different to literally anything else, the unique is undefinable, thus the self as an 'creative nothing'.

Non-Self in Nominalism
Bertrand Russell argued that there is no word self as an existing object, as the word self is just a mere name.