Dehomag was a German business, effectively a franchisee of International Business Machines. The word was an acronym for Deutsche Hollerith Maschinenwerk Aktiengesellschaft - "German Hollerith Machine Works Company." "Hollerith" refers to the technology of punched cards.
Under Nazi Germany, DeHoMag was the company that sold and maintained the Nazi's collection of punch card machines. The use of this technology increased the efficiency of the Final Solution greatly.[1]