3-7-77
3-7-77 was the symbol used by the Montana Vigilantes (Vigilance Committee) in Virginia City, Montana, USA in the 19th century. People who found the numbers '3-7-77' painted on their tent or cabin knew that they had better leave the area or expect to be on the receiving end of vigilantism. The numbers are used on the shoulder patch of the Montana Highway Patrol, who claim they do not know the original meaning of the symbol, though the Association of Montana Troopers website says "Regardless of its meaning, however, 3-7-77 is emblematic  of the first organized law enforcement in Montana. The Montana Highway Patrol, in adopting this early symbol, honors the first men in the Montana Territory who organized for the safety and welfare of the people. For that same reason, the Association of Montana Troopers has carried on that tradition by placing the legendary 3-7-77 on their patch as well. It has been suggested the numbers represent the date the Vigilante Oath was signed in Bannack Montana, the first seat of Justice in the state. You can visit the Masonic Temple in the now ghost town and see the  Oath for yourself hanging on the wall. It is dated March 7, 1877. (3-7-77)" The symbol also appears on the flight suits of pilots of the Montana Air National Guard, and the Flight Patch of the Montana Army National Guard Medevac unit 1189th GSAB – Vigilantes. Further, it appears under the bottle cap of certain varieties of Big Sky Brewing Company beer. Origin. Various theories have been put forth about its meaning, including: