According to tradition, the six lines of classic standards are embodied by the first letter of each line, thus:

1. « P »     Pluto
   

2. « C »    Conversano
   

3. « F »     Favory
   

4. « M »    Maestoso
   

5. « N »    Neapolitano
   

6. « S »     Siglavy
   

But when it is, not the stallion itself, nor its lineage, but the father of the mother (maternal grandfather) of a colt or a filly, it is no more a capital letter that is used, but a sign:

                 

Entering the Spanish Riding School of Vienna, each stallion is assigned a number associated with his name.