K21 (disambiguation)
Appearance
K21 may refer to:
- K21, a military vehicle
- the ICD-10 code for the gastroesophageal reflux
- Schleicher ASK 21, a glider
- "Va, dal furor portata", K. 21, an early concert aria in C major for tenor and orchestra by Wolfgang Amadeus Mozart
- The k21 family of uniform polytopes
- Soviet submarine K-21