Hey, I've recently taken an interest in the military of the Kingdom of Italy, and noticed they had a surprisingly organized and satisfyingly simple designation system for tanks. The tank would be named "xy/z" with "x" being "l", "m", or "p" for "light", "medium" and "heavy", with "y" representing the weight of the tank in tons, and "z" being the last two digits of the year in which the tank entered service. So the L3/33 tankette was a light tank, weighed 3 tons, and entered service in 1933. I quite like this system.

However, the system of naming fighter planes seem much stranger. Let's look at the CR.42 biplane. "CR" stands for "Celestino Rosatelli", the designer of the aircraft, and I have no idea what the "42" means. Another example is the C.202 monoplane. The "C" stands for "Castoldi", the last name of Mario Castoldi, the plane's designer. Strangely it doesn't use his full name like the CR biplanes. I have no idea what the "202" stands for.

Does anyone have any knowledge of the system that was used? Did it vary from manufacturer to manufacturer? Thanks!