When a train carrying Jewish prisoners arrived “selections” would be conducted on the railroad platform, or ramp. Newly arrived persons classified by the SS physicians as unfit for labor were sent to the gas chambers: these included the ill, the elderly, pregnant women and children. In most cases, 70-75% of each transport was sent to immediate death. These people were not entered in the camp records; that is, they received no serial numbers and were not registered, and this is why it is possible only to estimate the total number of victims.
Nazi, the informal and originally derogatory term for a party member, abbreviates the party's name (Nationalsozialist German pronunciation: [natsi̯oˈnaːlzotsi̯aˌlɪst]), and was coined in analogy with Sozi (pronounced [ˈzoːtsiː]), an abbreviation of Sozialdemokrat (member of the rival Social Democratic Party of Germany). Members of the party referred to themselves as Nationalsozialisten (National Socialists), rarely as Nazis. The term Parteigenosse (party member) was commonly used among Nazis, with its corresponding feminine form Parteigenossin.