What is the meaning of Pirn?

A cone-shaped spool or bobbin on which thread or yarn is wound, used most often for weaving.

The amount of thread wound on a shuttle or reel.

To wind (yarn) onto a pirn, usually by means of a pirn winder.

pear (fruit or tree)

light bulb

a bad surprise, unexpected unpleasantness

Source: wiktionary.org