The term "kidney grille" refers to a specific design element in automobiles, where the front grille is shaped like an inverted kidney bean. Full definition
Flat, focused headlights, which are available with LED technology, point towards the heart of the front — the double kidney grille with a chrome surround. (bmw.com.my)
It includes redesigned front and rear bumpers as well as side skirts and an optional black kidney grille. (paultan.org)
The radiator grille including kidney grille bars is also in black. (topspeed.com)