The nomenclature for the cars I grew up with is that the more letters the better, with some intuitive associations:
@Arde and others mentioned something really important: letters may have more than one meaning. If not, marketing departments would be reduced to 26 attributes. Imagine all car manufacturers agreeing over 26 abbreviations. Sounds funny. This is not to talk me out of a bad situation.
Last night I looked at some files, books and else for fun. Hope you like it.
A - Aerodinamica, Alleggerita, Anteriore, Alfieri, Automatik/Automatique, Alpine, Alberi
B - Berlinette/Berlinetta, Brown, Berline/Berlina, Buick, Boxer
C - Coupé, Cabriolet, Cilindri, Camshaft, Carburettors/Carburatori, Carro, Compression, Competizione, Corsa
D - David, Development, Drop, Diesel, Drauz
E - E-Type, Einspritzanlage, Elettro, Electronique, Export, Entwicklung
F - Facel, Fixed/Fissa, Formula, Fastback, Front
G - Grand/Gran, Ghisa, Gordini
H - Head, High
I - Inter/Internazionale, Injection/Iniezione, Iso, Independente
J - Junior
K - Karmann, Kurz/Kurzheck
L - Lang/Lungo, Leicht/Légère, Luxus/Luxe/Lusso, Longitudinale, Linguette, Low
M - Maggorita, Motorsport, Meisterstück, Monoposto, Moskwa, Modificata, Motor, Monza
N - ?
O - Omologata, Open, Oro
P - Project, Posteriore, Personenkraftwagen/Personvagn, Petrol, Prototipo, Porte
Q - Quadrifoglio
R - Racing, Renovata, Radiale, Rivolta, Rulli, Riportata, Renault, Rossa, Roadholding
S - Super, Sport, S-Type, Seater, Spider/Spyder, Single, Sverige, Sondermotor
T - Tourisme/Turismo, Tubolare, Twin, Transversale, Testa, Two, Trazione, Tatra
U - ?
V - Veloce, V-engine, Vega, Valvole, Verde
W - Wagen, Weiterentwicklung
X - Extra, X-Drive
Y - ?
Z - Zagato
No modern cars. Two or more letter codes were mostly omitted. If you like to know where I found what please ask quickly. Probably won't remember things for long.