Sonderabteilung (English: Special Unit) is a German word often used to refer to some special German military formations during World War II. This term was similar to a detachment or battalion.
Several of the formations were created as penal military units composed of disgraced SS troops and criminals convicted of petty crimes.
List of sonderabteilungen (incomplete)
References
Sonderabteilung Wikipedia(Text) CC BY-SA