When breeding Savannah cats the specifics can become confusing.
Listed below are the A,B,C & 1,2,3,4,5, etc. Registration Codes.
Ancestry Record Code for Savannah Cats: (Serval cats are an unregistered breed.)
Hybridization Codes: (Example: F4A)
Stud Book Codes:
Our F1 Savannah “Dora” would be TICA registered as an F1A.
Dora’s offspring would be TICA registered as F2B.
From Luxury Savannah’s @ https://www.luxurysavannahs.com/f2-info