What is the meaning of Picker?

Agent noun of pick; one who picks.

A worker in a warehouse, responsible for retrieving ordered items.

Any user interface control that selects something.

A machine for picking fibrous materials to pieces so as to loosen and separate the fibre.

The piece in a loom that strikes the end of the shuttle and impels it through the warp.

A priming wire for cleaning the vent, in ordnance.

A fragment of gold smaller than a nugget but large enough to be picked up.

One who removes defects from and finishes electrotype plates.

A pilferer.

picker (machine)

Source: wiktionary.org