Sixteen kinds of emptiness

Sixteen kinds of emptiness, or shunyata (Tib. tongnyi chudruk; Wyl. stong nyid bcu drug), which are mentioned in Chandrakirti's Madhyamakavatara:

1. emptiness of the outer
   
2. emptiness of the inner
   
3. emptiness of the outer and inner
   
4. great emptiness
   
5. emptiness of the beginningless and endless
   
6. emptiness of the conditioned
   
7. emptiness of the unconditioned
   
8. emptiness of emptiness
   
9. emptiness beyond extremes
   
10. natural emptiness
    
11. emptiness of the unobserved
    
12. ultimate emptiness
    
13. emptiness of the indispensable
    
14. emptiness of the essential nature of non-entities
    
15. emptiness of all phenomena
    
16. emptiness of specific characteristics