This line of instruments unequivocally recalls the medieval shield, a defensive instrument but also a symbol of belonging and powerful.

Since when man has become a warrior, he adopted offence instruments adapting the same instruments used for working and hunting.
Studying the trees and the way in which they resist to the axle strokes, people began using axles for defending themselves by the enemy strokes; in this way the shield evolved like the arms.
Due to its form and visibility, the shield was the first place on which people placed a sign, giving origin to the evolution of heraldic.