How do you spell Pointer

Available Definitions:
1)  n. - One who, or that which, points.
2)  n. - The hand of a timepiece.
3)  n. - One of a breed of dogs trained to stop at scent of game, and with the nose point it out to sportsmen.
4)  n. - The two stars (Merak and Dubhe) in the Great Bear, the line between which points nearly in the direction of the north star.
5)  n. - Diagonal braces sometimes fixed across the hold.