Creating an image, drawing, or painting in order to display it by affixing it within a frame of wood (generally) or by attaching it  to a backdrop, for example  a matte board, is known as mounting. Antique paintings and drawings prepared to display it by mounting may be referred to as a mounting.  
 
The term is also used to refer to decorative metal pieces that are installed on wooden furniture. 
 
Again, the term is used to refer to antique medal mountings.