A hogging truss is a system of overhead reinforcement to prevent the vessel from hogging while under load. Egyptian examples are perhaps the earliest, consisting of a heavy rope or cable (hog-rod, hog-chain) run from pillars or posts (hog-post) forward and aft. The cable would sometimes pass over a pole at midships, which provided additional tension as the hull hogs. This tension resists the hogging moment. Later examples used steel or iron constructions in place of the cable, which may be straight or elliptical in profile. Some sailboats masts have guy-wires running fore & aft, effectively forming a hogging truss while staying the mast.