Wise men do not urinate into the wind or on the floor

This post is on the personal side.  I go into what Americans would call the "restroom" tonight after dinner.  The door had a sign called WS with the universal icon for a man.  Carefully I enter and see a row of urinals. Once at the urinal I noticed a fly etched into the porcelain. Here is the story.

But I don't know what WS stands for nor can I google it. Follow this link to a blog that has a lot of info but no real mention of my quandary.