What does '4c' indicates in a 'Alfa Romeo 4c' car
The name 4c is taken from the racing tradition. The name indicates that it has been inspired by the sports cars of the past years such as the 8C and the 6C. they borrow the carbon fiber, aluminium and rear wheel drive configuration. You can read more about the car on http://www.caranddriver.com/news/alfa-romeo-4c-concept-from-the-geneva-auto-show-news.
I'd assume it means "4 cylinder engine," but I probably shouldn't make assumptions. ;-)