During the Second World War concentration camp tattoo used for branding the prisoners and their subsequent identification. The members of the German SS compulsorily branding. SS prick tattoo on his shoulder, in the sky or under the arm. In addition to the letters SS, it also contains blood group.This tattoo gave an advantage to the provision of medical care in hospitals, as well as contributed to the rapid blood transfusion if necessary. Selecting a location for tattoos is not accidental. The skin under his arm persisted even burned corpses and injured, in which the tattoo will not be visible almost impossible.After the war served as a tattoo to catch Nazi criminals.