Type 21
Type 21 (also Type 21 or Type XXI ) stands for
- Eifelland Type 21 or Eifelland-March E21 , a Formula 1 racing car from the Eifelland Caravans team
- LAWA type 21 ( lake outflow shaped river ), a river type
- Peugeot Type 21 , a car model made by the car manufacturer Peugeot
- Type XXI, official designation of the German submarine class XXI
- Type 21 or Amazon-class , a type of frigate used by the Royal Navy
- Type 21 radar, a radar used by the Imperial Japanese Navy