Nazi concentration camp badge
The Nazis also used the black triangle to identify people with mental illnesses and "mentally disabled" people. Written on their badges was the word , which means "stupid." This category included people with autism. (At that time, autism was called Asperger's Syndrome, named after Austrian pediatrician Hans Asperger, who was involved with the Nazis).  People with schizophrenia and epilepsy also wore black triangles. Instead of being sent to concentration camps, many people in this group were forcibly sterilized, shot, or gassed in psychiatric institutions as part of the T4 Euthanasia Program.