The bar consisted of layers of wafer, caramel, and chocolate creme, and was covered in chocolate, and was suitable for a vegetarian diet. Taxi used to be available in multi-packs using a yellow and blue wrapper, in a New York taxi cab style design.
The bar's structure (wafer, caramel, chocolate creme) and its vegetarian suitability are key features. The packaging design (yellow and blue, taxi cab style) is also significant.