The trumpet courgette of Albenga owes its name to the usually elongated shape of the fruit and to the fact that, growing spontaneously, lying on the ground without supports, it tends to twist 360° like a trumpet.
Then the fact of having the apex of the fruit enlarged (the ovary is located in it) contributes even more to giving the idea of a trumpet.
The “trombetta”, as it is known on the markets, is not twisted since its most suitable form of cultivation is the pergola: as it grows, the fruit tends to stretch downwards. Therefore when harvested it is straight or nearly so.
Source Wikipedia