The 3D decoration is crescent-shaped, and at the ends it has decorative elements called volutes. Volutes are spiral (rolled-up) scroll-like design elements characteristic of ancient Greek art (Ionic and Corinthian order). Such 3D decorations have been carved in wood throughout history (today with CNC engraving machines), and you can often find them as decorations on furniture. In the picture you can see what the 3D scroll ornament looks like, and has been drawn in 3D Rhinoceros software using the commands for drawing 3D surfaces.