Barnstar

[2] Barnstars were meant to represent the mark of the builder but became more frequently used for aesthetic purposes and were added to the building after construction was complete.

[3][4] Enthusiasts have traced a number of wooden barnstars to individual builders in the Pennsylvania area, where numerous examples can still be seen.

Their regular use preceded that time, however, and stars were commonplace on large buildings, particularly factories, in pre-war Richmond, Virginia.

Strictly speaking, they are defined apart from barnstars and visually bear only passing resemblance, but the two are often confused and their names are even regarded as interchangeable.

[7] The term barnstar has been applied to star-shaped anchor plates that are used for structural reinforcement, particularly on masonry buildings from the 18th and 19th centuries.

A barnstar
A commonly used "barnstar" image on Wikimedia projects