Image

https://en.wikipedia.org/wiki/Image_(mathematics) https://en.wikipedia.org/wiki/Inverse_image

The image of a function is the set of all output values it may produce.

More generally, evaluating a given function f at each element of a given subset A of its domain produces a set, called the "image of A under (or through) f".

Similarly, the inverse image (or preimage) of a given subset B of the codomain of f, is the set of all elements of the domain that map to the members of B.

Image and inverse image may also be defined for relations, not just functions.