From Wikipedia:
Düppel can refer to:
- The German name for Dybbĝl, a town in Denmark famed for an 1864 battle
- Berlin-Düppel (named after the battlefield mentioned above)
- Düppel Forest, a forest in south of Berlin
- Chaff (radar countermeasure)
Several German electronic devices seem to have used place names (Lichtenstein, Hohentwiel, Kehl, Rotterdam-Gerät) so I suppose it does relate to one of the above places.