The five-pointe red star, a pentagram without the inner pentagon, is a symbol of communism as well as broader socialism in general. It is sometimes understood to represent the five fingers of the worker's hand, as well as the five continents. A lesser known suggestion is that the five points on the star were intended to represent the five social groups that would lead Russia to communism: the youth, the military, the industrial labourers, the agricultural workers or peasantry, and the intelligentsia. Karl Marx and Friedrich Engels used the red star as a symbol. It was also one of the emblems, symbols, and signals representing the Soviet Union under the rule and guidance of the Communist Party, along with the hammer and sickle. The star has since become a symbol representing socialism of all varieties.