A stop sign is shaped like an octagon. The octagonal shape is distinctive and easily recognizable from a distance, making it effective for signaling drivers to come to a complete stop. This design has been standardized in many countries to ensure consistency in road signage, increasing safety and reducing accidents. The stop sign is usually painted red with white lettering, further enhancing its visibility. The use of an octagonal shape helps differentiate stop signs from other traffic signs, ensuring that drivers respond appropriately when they encounter this critical traffic control measure.