The combination of various objects into a whole.

- The
**union of sets**:

Consider two sets*A*and*B*within the universe*U*. The union of sets*A*and*B*is the set of elements in*U*that belong to either set*A*or set*B*or both. Therefore, the union of*A*and*B*is both the operation, denoted by \(\cup \), and the result of this operation, which is the set of elements that belong to*A*or to*B*. - The
**union of geometric objects**:

The set of points that belong to various objects in geometric space.