If you just see 'cotto' on a pizza menu, it means prosciutto cotto (cooked rather than cured ham)
cotto a bassa temperatura: cooked at a low temperature (often sous-vide)
ben cotto: well done. Never for a bistecca alla fiorentina, but the usual way of cooking lamb chops.
cotto a puntino: cooked to perfection
Image by Birte, Public Domain