What's 9-ball?

[Duskygrin]

. .

[Vera]

A form of billiard.

Nine ball is a contemporary variation of pocket billiards,
from http://en.wikipedia.org/wiki/9_ball

lolz rack.

Basically, you pocket balls using a cue stick to hit them into pockets. The balls are numbered, they go from 1 to 9.

[offspringer24]

it is just pool

[Ocupation: Offspring]

9-ball is a type of pool. You hit every ball in the order to 9 (1,2,3,4,5,6,7,8,and 9)