non-self
Definitions
In biology and immunology, substances or cells that are recognized by the immune system as foreign to the body.
In philosophy and psychology, the concept of that which exists outside or is distinct from an individual's sense of identity or ego.
Examples
In Buddhist philosophy, the concept of non-self suggests that there is no permanent, unchanging soul or essence within an individual.
The immune system is highly evolved to distinguish between self and non-self antigens to protect the body from pathogens.