What does 'B' and 'S' stands for in Toyota vitz 2005 automatic transmission?

Hi,

For S just stands for SPORT MODE like for faster take offs. or exact is another Word for speed and over drive for HILLS and hard driving conditions slow lanes. S is for faster and intence roads. takes more petrol

and D is for normal drive petrol effecient

B is for Brake. when your going down steep hills and it is to fast you dont need to use brakes that much it is a auto mission to slow your wheels down while going down.