What does the 'GTB' acronym stand for in Ferrari model names?

In Ferrari model names, GTB stands for Gran Turismo Berlinetta.

The Italian phrase describes a grand-touring berlinetta, traditionally a fixed-roof two-seat coupé. Ferrari has used the suffix on models including the 308 GTB, 328 GTB, 488 GTB and 296 GTB. Berlinetta distinguishes the closed body style from Ferrari’s open-top Spider or GTS variants.

The letters are part of Ferrari’s long-running naming language, but they do not tell the whole story. Numbers often refer to engine characteristics: the 308, for example, combines an approximate 3.0-litre displacement with eight cylinders, while the 296 uses a 2.9-litre engine and six cylinders. Naming conventions have varied across eras, so individual models need context.

GTB is also easily confused with GTO, which stands for Gran Turismo Omologato, or homologated grand tourer. GTB identifies the berlinetta body style; GTO signals a different historical and racing-related designation.