wtf

Maybe for St. Joan of Arc as her canonization anniversary yesterday.  And Fleur de Lis on her heraldry. 

There's a thread in the public forums:

https://www.chess.com/forum/view/chess-variants/random-flower-things

(here it's just for Variants Club members' eyes)

That's weird... I don't know either what this symbol means and why it is here in fog of war