The Nazis used a variety of methods to carry out "special treatment," including mass shootings, gas chambers, and starvation. The victims were often subjected to horrific torture and abuse before being killed.
The term "special treatment" was first used in an official Nazi document in 1941. It was subsequently used in a number of other documents, including the Wannsee Protocol, which outlined the plans for the Final Solution.
The use of euphemisms like "special treatment" was part of the Nazis' attempt to dehumanize the Jews and other victims of the Holocaust. By using such terms, the Nazis sought to make it easier for their perpetrators to carry out their crimes.