In heraldry, compony describes a border, bend, chevron, or other ordinary made up of alternating squares or rectangular panels in two tinctures, and its effect is less about one fixed symbolic meaning than about ideas of ordered union, alliance, and balanced composition. Because the pattern joins contrasting colors into a single continuous structure, it is often read as suggesting the coming together of families, lordships, offices, or territories, and for that reason it can imply dynastic connection, feudal relationship, or a carefully maintained civic or political order. In medieval armory it was also prized simply for its bold visibility and decorative strength, especially on bordures and bends, and in some cases it served as a mark that distinguished one branch of a house from another.

 Well-known examples include the blue-and-silver bordure compony of the ancient Stewart or Stuart royal arms of Scotland, one of the most famous uses of the treatment in British heraldry, and compony also appears widely in Continental armory, particularly on borders and sashes where heralds wanted a shield to look both noble and emphatically structured. So while compony is a pattern rather than a creature or object, it still carries a clear heraldic message: contrast brought into harmony, difference arranged into order, and lineage or authority expressed through disciplined design.