augmentation of arms

In heraldry, an augmentation (often termed augmentation of honour or sometimes augmentation of arms) is a modification or addition to a coat of arms, typically given by a monarch as either a mere mark of favour, or a reward or recognition for some meritorious act. The grants of entire new coats by monarchs as a reward are not augmentations, but rather grants of arms, and (in theory) an augmentation mistakenly given to someone who did not have a right to a coat would be nugatory.