This breaks down for professionals that are self taught though. For example, I still to this day, say in my head "F-Stab " for fstab, instead of "F-S-Tab", and various other terms I learned when i was learning linux myself when I was 13. Didn't understand at the time that it stood for filesystems table, so f-stab is how I pronounced the term in my head. In the UEFI case, I'll just pronounce each letter at a time, U-E-F-I.