OA membership and Lodge affiliation are indicated by the wearing of the lodge emblem (commonly known as a lodge flap), an embroidered patch is worn on the right pocket flap of the uniform shirt. Each lodge flap has a unique design, generally reflecting the name, geography or history of the lodge. Part of this is a totem that represents the lodge. Special issues of flaps may be created to commemorate anniversaries and other events and are a popular item for those who engage in Scouting memorabilia collecting. At formal events or Order of the Arrow functions, Arrowmen can be readily identified by a white sash bearing a red arrow that is worn over their right shoulder. An Ordeal member wears a sash with a lone arrow. The Brotherhood member wears a sash bearing an arrow with a red bar at each end of the arrow. A Vigil Honor member wears a sash with the same bars of as the Brotherhood sash at each end of the arrow, and a Vigil Honor triangle on the center of the shaft. The OA sash is not worn at the same time as the merit badge sash, nor worn folded in the belt. The sash as a form of recognition dates to the founding of the Order and has a long history of changes in usage and design.