In heraldry, a comet is a striking celestial charge that typically symbolizes brilliance, renown, divine guidance, and the appearance of something extraordinary, since comets were long understood as rare signs in the heavens that announced momentous change or drew attention to great events. As a result, the emblem can suggest high ambition, sudden distinction in service, a memorable turning point in a family’s history, or a reputation that shines far beyond its place of origin, while in religious or moral readings it may also hint at providence, vigilance under heaven, or light breaking into darkness.

The comet is less common than the mullet or estoile, which gives it a special visual force when it does appear, and in heraldic art it is usually shown as a star or fiery head with a streaming tail, sometimes very close in appearance to a blazing star depending on the period and tradition. Reliable famous examples are not as numerous or universally recognized as those for lions, eagles, or crosses, but comets do appear in both British and Continental armory, especially in later grants and civic or institutional heraldry where celestial imagery was used to mark aspiration, discovery, or exceptional achievement. That relative rarity is part of its appeal, because a comet in a coat of arms does not merely decorate the shield, it announces a bearer who wished to be seen as notable, heaven-marked, and impossible to overlook.