Merriam-Webster Collegiate Dictionary - pointer

 noun  Date: 1574  1.  a. plural, capitalized the two stars in the Big Dipper a line through which points to the North Star  b. one that points out; especially a rod used to direct attention  c. a computer memory address that contains another address (as of desired data)  2. a large strong slender smooth-haired gundog that hunts by scent and indicates the presence of game by pointing  3. one that furnishes with points  4. a useful suggestion or hint ; tip