Under the laws of heraldry, a particular design may be inherited, or varied for different individuals within a particular family so that each individual is readily identified and not confused with another. Thus an heraldic design (or coat of arms) has the same unique function as an identity or social security number. Unlike such numbers, a coat or shield should be visually pleasing and may be invested with meaning or symbolism to the owner. 

Heraldry can be used in many different ways.  Traditionally a particular heraldic design was displayed on the front of a shield carried by the owner of that design.   It was also worn as an overcoat (hence the term, 'coat of arms') and displayed on banners.  Heraldic designs may also be used to indicate ownership, for example on flags, vehicles, bookplates, glassware, crockery and cutlery (the 'family silver').  The uses are limited only by taste, preference and perhaps custom.

The heraldic artist may demonstrate proficiency in many ways, including drawing, painting, carving, engraving, embroidering, sewing, or as a sculptor or potter.