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.

Some Wiki-based communities give their users an award called a "barnstar" as a continuation of the "barn raising" metaphor.