"Grille shape" refers to the design or pattern of the front grille on a vehicle, which is the part that allows air to flow into the engine compartment. Full definition
There is a unique chrome grille shape, flowing bumper corners, and a strong bumper. (topspeed.com)
As we saw in previous teaser photos, the 2017 Hyundai Elantra's front end adopts the corporate hexagonal grille shape seen on many other Hyundai models. (automobilemag.com)
Mitsubishi also says that the XR - PHEV Evolution's front grille shape previews the look of future Mitsubishi products; for better or for worse, we think it looks a lot like the polarizing Lexus spindle grille. (automobilemag.com)