pointer

Short definition from Wiktionary

Noun

1. 1
   Anything that points or is used for pointing: One who points.
2. 2
   Anything that points or is used for pointing: A teacher's pointer, pointing stick, a rod with an arrow.
3. 3
   Anything that points or is used for pointing: A needlelike component of a timepiece or measuring device that indicates the time or the current reading of the device.
4. 4
   Anything that points or is used for pointing: A breed of hunting dog, trained to point out game.
5. 5
   Anything that points or is used for pointing: A variable that holds the address of a memory location where a value can be stored.
6. 6
   Anything that points or is used for pointing: An icon that indicates the position of the pointing device, such as a mouse.
7. 7
   A tip, a bit of advice.
8. 8
   Something that gives a point (sharp end) to something.
9. 9
   Something worth a given number of points.

Proper noun

1. 1
   A surname.