The figure above shows a chart with the prisoner markings used in German concentration camps. The list of vertical mark categories for the following types of prisoners: political, professional criminal, emigrant, Bible Students (such as Jehovah's Witnesses were then known), homosexuals, and other nationalities. The horizontal categories begin with the basic colors, and then show the recidivists, Jews, Jews who have violated racial laws for having sex with Aryans and Arians who have violated racial laws for having sex with Jews. In the lower left corner, P is for Poles and T for Czechs. The remaining symbols give examples of mark patterns.

Nazi concentration camps during World War II had a set of geometric figures in the form of triangles to help identify the type of person who carried it. Some historians say inverted, however, it is with respect to color, inclinations and overlapping figures that were based the criteria for classifying the segregated in their respective fields.