René Descartes is credited with the famous statement 'Cogito, ergo sum' ('I think, therefore I am') in his work 'Discourse on the Method'.

The bundle theory of the self is a philosophical theory that states that the self is a collection of mental states and processes, rather than a unified, unchanging entity.

Heraclitus, a pre-Socratic philosopher, famously said, 'Everything flows,' suggesting that the self is not a fixed entity but rather a constantly changing process.

The phenomenal self is the part of the self that is aware of its own thoughts, feelings, and experiences.

The social self is the part of the self that is shaped by our interactions with others.

George Herbert Mead, a social psychologist and philosopher, argued that the self is a social construct that develops through interaction with others.

The narrative theory of the self is the theory that the self is a narrative that we construct about our own lives.

William James, an American philosopher and psychologist, argued that the self is not a unified entity but rather a collection of different selves.

Anātman is the Buddhist concept that the self is an illusion.

Ludwig Wittgenstein, an Austrian-British philosopher, argued that the self is a product of language.

Transcendental unity of apperception is the term used by Immanuel Kant to describe the unity of consciousness that makes experience possible.

Michel Foucault, a French philosopher, argued that the self is a product of power relations.

Fluid self is the term used to describe the idea that the self is a fluid and dynamic entity that is constantly changing.

Judith Butler, an American philosopher, argued that the self is a site of resistance to power.

Performative self is the term used to describe the idea that the self is a performative act.