Three mullets argent, one and two may be placed (where appropriate) upon the arms of any individual or group recognized for exceptional service to the kingdom of a nature not normally recognized through Society awards, such as actions of a particularly honorable or charitable nature. Those Augmentations bestowed prior to May 2001 may take the form - Three mullets argent, fesswise.
As Used By The College of Arms of the Society for Creative Anachronism, Inc. Revised: December 23, 2003
An honor added to a registered device. First, the Crown of a kingdom must give the recipient of the augmentation the right to add a charge or charges to a registered device as an honor, then the honor must be registered with the College of Arms. An augmentation is not registered as a change of armory; instead, both the underlying arms and the arms with augmentation are protected. Therefore, the underlying armory can be changed while keeping the augmentation the same (assuming no style problems result). Augmentations are usually registered by the College of Arms in the form "[Blazon of device], and as an augmentation, [blazon of augmentation]".