In building, a camber beam is a piece of timber cut archwise, and steel bent or rolled, with an obtuse angle in the middle, commonly used in platforms as , and other occasions where long and strong beams are required. The camber curve is ideally a parabola, but practically a circle segment as even with modern materials and calculations, cambers are imprecise. A camber beam is much stronger than another of the same size, since being laid with the hollow side downwards, as they usually are, they form a kind of supporting arch.