Fimbriation
In heraldry and vexillology, fimbriation is the placement of small stripes of contrasting colour around common charges or ordinaries, usually in order for them to stand out from the background, but often simply due to the designer's subjective aesthetic preferences, or for a more technical reason (in heraldry only) to avoid what would otherwise be a violation of the rule of tincture. While fimbriation almost invariably applies to both or all sides of a charge, there are very unusual examples of fimbriation on one side only.