in my post entitled o balls!, which you can read here, i forgot to mention high ball and low ball.
the high ball is a mix of some sort of whiskey -- usually scotch or bourbon -- and a nonalcoholic mixer, such as soda pop or water. it's served in a tall glass.
the low ball is a drink that's a mix of a whiskey and water, served with a piece of fruit as a garnish. it's served in a short glass that's between 6-10 ounces in capacity.
low ball is also a poker term where the player tries to get a lower hand to win. an example of this is a 5-4-3-2-a, which is called a wheel. a friend played that hand the last time i played poker about 12 years ago; he called it a straight around the horn. he lost the hand, any way.
but no matter what -- you never hear of the middle ball or central ball.