|  | 1 | 
            
              | UN/ECE level A |  
              | As defined in the basic code table of ISO 646 with the exceptions of lower case letters, alternative graphic character allocations and national or application-oriented graphic character allocations. |  | 
        
          |  | 2 | 
            
              | UN/ECE level B |  
              | As defined in the basic code table of ISO 646 with the exceptions of alternative graphic character allocations and national or application-oriented graphic character allocations. |  | 
        
          |  | 3 | 
            
              | UN/ECE level C |  
              | As defined in ISO 8859-1 : Information processing - Part 1: Latin alphabet No. 1. |  | 
        
          |  | 4 | 
            
              | UN/ECE level D |  
              | As defined in ISO 8859-2 : Information processing - Part 2: Latin alphabet No. 2. |  | 
        
          |  | 5 | 
            
              | UN/ECE level E |  
              | As defined in ISO 8859-5 : Information processing - Part 5: Latin/Cyrillic alphabet. |  | 
        
          |  | 6 | 
            
              | UN/ECE level F |  
              | As defined in ISO 8859-7 : Information processing - Part 7: Latin/Greek alphabet. |  | 
        
          |  | 7 | 
            
              | UN/ECE level G |  
              | As defined in ISO 8859-3 : Information processing - Part 3: Latin alphabet. |  | 
        
          |  | 8 | 
            
              | UN/ECE level H |  
              | As defined in ISO 8859-4 : Information processing - Part 4: Latin alphabet. |  | 
        
          |  | 9 | 
            
              | UN/ECE level I |  
              | As defined in ISO 8859-6 : Information processing - Part 6: Latin/Arabic alphabet. |  | 
        
          |  | 10 | 
            
              | UN/ECE level J |  
              | As defined in ISO 8859-8 : Information processing - Part 8: Latin/Hebrew alphabet. |  | 
        
          |  | 11 | 
            
              | UN/ECE level K |  
              | As defined in ISO 8859-9 : Information processing - Part 9: Latin alphabet. |  | 
        
          |  | 12 | 
            
              | UN/ECE level X |  
              | Code extension technique as defined by ISO 2022 utilising the escape techniques in accordance with ISO 2375. |  | 
        
          |  | 13 | 
            
              | UN/ECE level Y |  
              | ISO 10646-1 octet without code extension technique. |  | 
        
          |  | 14 | 
            
              | UN/ECE level W |  
              | ISO 10646-1 octet with code extension technique to support UTF-8 (UCS Transformation Format, 8 bit) encoding. |  |