Introduction (4)Tri-wheel vehicle model The principal character code,expressed by three numbers. Feature code,expressed by three capital letters. The category code.For tri-wheel vehicle,it is 7Y. Company code,expressed by two to three Chinese characters. Figure 0-4 Meanings of numbers and letters in tri-wheel vehicle models 械电子工程学度 Automobile and Tractor Northwest A&F University Automobile and Tractor Northwest A&F University Introduction (4) Tri-wheel vehicle model The principal character code, expressed by three numbers. Feature code, expressed by three capital letters. The category code. For tri-wheel vehicle, it is 7Y. Company code, expressed by two to three Chinese characters. Figure 0-4 Meanings of numbers and letters in tri-wheel vehicle models