Exit Points are used in Submachine states and State Machines to denote the point where the machine is exited and the transition sourcing this exit point, for Submachines, is triggered. Exit points are a type of pseudo-state used in the State Machine diagram.
OMG UML Specification:
The OMG UML specification (UML Superstructure Specification, v2.1.1 p. 538) states:
An exit point pseudostate is an exit point of a state machine or composite state. Entering an exit point within any region of the composite state or state machine referenced by a submachine state implies the exit of this composite state or submachine state and the triggering of the transition that has this exit point as source in the state machine enclosing the submachine or composite state.