Clicker

Noun

 * 1)  The remote-control device used to change settings on a television set, VCR, or other electronic equipment.
 * 2) A person who cuts out the uppers of shoes from pieces of leather using a flexible knife that clicks as it changes direction.
 * 3) A machine that cuts materials using a steel rule die.  The name comes from the sound (click) when the material is cut.  May be hand, pneumatic, or hydraulic powered.
 * 4) A signalling device used by military forces. Pressed between thumb and fingers, it makes a small but distinctive click understood by other members of a unit.
 * 5) A small mechanical device that produces a clicking sound, used in dog training.
 * 6) Someone who clicks, for example on internet hyperlinks.