How many letters of the alphabet have plane of symmetry?

14 capital letters of the Latin alphabet and 7 lower case letters have planes of symmetry:

Capital letters:

1. A
   
2. C
   
3. D
   
4. H
   
5. I
   
6. M
   
7. O
   
8. S
   
9. T
   
10. U
    
11. V
    
12. W
    
13. X
    
14. Y
    

Lower case letters:

1. c
   
2. l
   
3. o
   
4. s
   
5. v
   
6. w
   
7. x