The word probably derives from paciòn or da paciòso, which means chubby, bold: it is the pliers made like a fireplace caliper with rounded wooden rods. They are used to shape the surface of the glass without swiping during processing.

Credits:
Credits to: Parole di vetro - Marsilio editore ISBN 88-317-7198-1
Pictures by: Bruno Carnevali
Designs by: Alessandro Lenarda