The various noble Houses of the Seven Kingdoms use distinctive heraldry to identify families and individuals. These heraldic devices are also carried by armies on the battlefield as a sign of status, as well as allegiance to those noble houses.
Heraldic designs can vary widely. They may consist of a simple pattern of colors, but more often feature animals (either real or mythological) and/or physical objects. Specific sets of rules govern what form a heraldic design may take.
Info Link: https://gameofthrones.fandom.com/wiki/Heraldry
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