DuckCorp Dico

Found one definition

1.                 From fr.wiktionary.org:
                   
   
   
                   
                     
   [WBS]
   
   ** [en]
   
   *** [étymologie]
    [en]  Abréviation de west by south .
   *** [nom]
   [rose des vents/en] WBS
   
    1. [en]  O¼SO  abréviation de ouest-quart-sud-ouest .
   *** [anagrammes]
   
    - [SbW]