The Reock Score is a mathematical measure used to evaluate the compactness of electoral districts, often in the context of gerrymandering and redistricting. It compares the area of a district to the area of a circle that has the same perimeter as that district, providing a numerical value between 0 and 1. A score closer to 1 indicates a more compact shape, while a lower score suggests irregular or elongated shapes commonly associated with gerrymandering.