This is a "Digital Input Pin" component.
The component looks like following image when put on the schematic at first.
When you configure the component with the Component Configuration Tool, the shape will be changed.
For example when the "interrupt" is set to "Rising Edge" and the "Dedicated interrupt" is checked,
The Pin component would have an irq output as follows.
Please refer the component datasheet which can be invoked by the "Open Datasheet" context menu item