Memory stones, thoughts stones.
Cobblestone-shaped brass squares set discreetly but firmly in the sidewalks in front of houses where the Nazis took people away. The little metal markers list the names, sometimes with more information. You can see these house-by-house memorials all over Germany now. On the 75th anniversary of Reichspogromnacht, the German news showed schoolkids in Berlin polishing the brass Gedenksteine and talking about what happened.
The flat little metal cobblestones are nicknamed “Stolpersteine” because you figuratively stumble across them as you’re walking around the towns.
(Geh DANE k sht EYE neh.)