Entry Point pseudo-states are used to define the beginning of a State Machine. An Entry Point exists for each region, directing the initial concurrent state configuration.
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OMG UML Specification
The OMG UML specification (UML Superstructure Specification, v2.0, p. 471) states:
"An entry point pseudostate is an entry point of a state machine. In each region of the state machine it has a single transition to a vertex within the same region."