1) German architectural term 
A stolperstein (ˈʃtɔlpəʁˌʃtaɪn from German, `stumbling block`; plural stolpersteine) is a monument created by Gunter Demnig which commemorates a victim of the Holocaust. Stolpersteine are small, cobblestone-sized memorials for an individual victim of Nazism. They commemorate individuals – both those who died and survivors – who were .....