The faculty of thinking, judging, abstract reasoning, and conceptual understanding; the cognitive faculty.
The capacity of that faculty (in a particular person).
A person who has that faculty to a great degree.
Sanity.
Bits of rolled-up rubber shed by the tires of race cars that accumulate at the edges of the track, especially at the corners.
Any of several children's games played with small balls (made of marble or more commonly glass).