black triangle
badge used in Nazi concentration camps to mark prisoners regarded “asocial” or “work-shy”, including thieves, murderers, prostitutes, nonconformists, nomads, Aryans who engaged in sexual relations with Jews, and lesbians
en-GB/ˈblæk ˈtɹaɪæŋɡəl/
en-US/ˈblæk ˈtɹaɪˌæŋɡəl/