The belt system used in most martial arts is relatively new. For centuries, students were only given a white belt. Through years of training the white belt would become soiled with dirt, grime and blood, becoming darker in the process, eventually becoming a black belt.
Although considered a racially insensitive term here in America, Sambo is an abbreviation of the Russian term Samozaschita Bez Oruzhiya, which means "self-defense without a weapon." Developed for the Russian military, Sambo was heavily influenced by Judo and indigenous Russian wrestling. It also features a military-inspired uniform, including belt loops on the fighting jacket.
Its most well-known practitioner is Fedor Emelianenko, a mixed martial artist nicknamed "The Last Emperor" who did not suffer a legimate loss for nearly 10 years.