Each end node has a special signaling channel to the connected switch called the UNI.
It is therefore connected to an end node.
The end node is visualized with a circle containing a cross, while the stop node is visualized with a circle containing a black dot.
A line-end node will not vary much, so it will not appear in front of a pimple.
The third cycle starts in the fork preceding the end node, and leads back to the join following the decision.