We have used Knee braces in applications other than gables, i.e. pergolas, planter boxes etc. According to Webster corbel would work. Knee is defined as piece of wood or timber bent for use in supporting structures coming together at an angle.
East of the Mississippi Corbel, West of the Mississippi Knee Brace.

We manufacture and install many types of braces, knee braces and cobels, balcony supports and reline and repair box gutters. Seasonal and prescheduled work can qualify for special pricing. We can bring back the original look and historical value to your architectural  wood work.