Pointer has several different meanings:

1. A long stick or rod used to indicate something specific, often on a map, board, or screen. Teachers might use a pointer to draw students' attention to important parts of a lesson written on the board. Before computers were common, lecturers often used wooden pointers to highlight details on projection screens. Today, many presenters use laser pointers that create a small red or green dot of light wherever they aim.
2. A needle or marker that shows a measurement or position. The pointer on a compass shows which direction is north. The pointer on a scale indicates your weight. Gas gauges, speedometers, and thermometers all have pointers that move to show current readings.
3. A dog breed trained to locate game birds for hunters. When a pointer detects a bird, it freezes in a distinctive pose with its nose aimed toward the bird, one front paw raised, and its tail extended straight back. This “pointing” behavior alerts the hunter to the bird's location.
4. In computer programming, a variable that stores the location of information in a computer's memory rather than the information itself. Think of it like writing down where you put something instead of carrying the thing around. Programmers use pointers to work efficiently with large amounts of data.