What is the name of the horizontal timber located at the peak of a roof truss that supports the common rafters?

Explanation

The ridge board is the horizontal timber fixed at the top of the roof truss which provides support to the common rafters. In contrast, a hip rafter runs diagonally from the ridge to the eaves, an eaves board is placed along the lower edge of the roof, and a valley rafter is located where two roof slopes meet internally.