Picker

noun

1. Agent noun of pick; one who picks.

   "The apple picker climbed the tree."

2. Any user interface control that selects something.

   "a date picker"

3. A machine for picking fibrous materials to pieces so as to loosen and separate the fibre.
4. The piece in a loom that strikes the end of the shuttle and impels it through the warp.
5. A priming wire for cleaning the vent, in ordnance.