I've found details in a 17th Century London Parish Register and am not sure what they mean. Here's an example:

Henry Singleton, w., & Mary Roch, w., John Moore.
Will. Good, w., & Joan Fort, s., John Bennet.
Will. Shaw, b., & Margaret Ellford, s., John Mitchell.
Tho. Atwell, b., & Anna Lane, s.. Will. Gumbie.

I know what the shortened names are, but what are the letters 's' 'w' and 'b' meant to mean