Rotary Sensor Potentiometer SP280X series
The electrical angle is independent of the pot's physical ability to turn. In other words, there are no physical stops.

Within the 100 degree operational range, it behaves like a regular pot - with the wiper traversing from the resistor terminal at one end of the "electrical" range to the terminal at the other end (100 degrees apart). When you go outside this range, the wiper would be open.

These pots are often used on the output shafts of gear-motors for position sensing, and a physical stop would break the pot if the motor ran outside of the 100 degree range.