What was the name of the distinctive sign of the knights on the shield?

The distinctive sign of the knights was depicted both on the shield and on the flag – this is the coat of arms. His goal was to distinguish his master from other knights, because they were all clad in iron armor from head to foot and it was rather difficult to understand who was who without distinctive signs. It was by the coat of arms that it was possible to determine who participates in the battle and to which family this knight belongs.