title: Type 21
text: # Type 21
  
  Type 21 can refer to:
  
  * Type 21 frigate, or Amazon-class frigate, a late-20th-century escort vessel of the Royal Navy.
  * Type 021-class missile boat, a Chinese missile-firing naval vessel first produced in about 1975, and still in production.
  * Type XXI submarine, a German technologically advanced submarine produced in 1945.
  * Type 21 Radar, a radar of the Imperial Japanese Navy
  