The following figure shows a history connector.

When a transition is attached to a history connector and that transition is triggered, the state containing the history connector recalls its last active configuration. A state can have a single history connector.
Transitions from a history connector are constrained to a destination on the same level as the history connector.
A state might have a history property used for recalling the recent active configuration of the state and its substates. Transitioning into a history connector associated with the state recalls the last active configuration.
A transition originating from the history connector designates the history default state. The default history state is taken if no history existed before the history enter.